From ‘Aaishah radi Allaahu ‘anhaa that Hamzah ibn ‘Amr al Aslamee radi Allaahu ‘anhu said to the Prophet sall Allaahu ‘alahi wa sallam:

Should I fast upon the journey?

And he was a person who was plentiful in fasting.

So he said, “If you wish, then fast. And if you wish, then abstain from fasting.”

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The Shaykh ‘Abdullaah ibn ‘Abdir Rahmaan aale Bassaam rahimahullaah (who died in 2003 CE) commented:

The Companions radi Allaahu ‘anhum knew that the Merciful Legislator did not give the concession to refrain from fasting upon a journey except as a mercy to them and out of compassion for them.

So Hamzah al Aslamee had steadfastness and strength upon fasting and he was one who loved al khayr (goodness), and was plentiful in fasting radi Allaahu ‘anhu . So he asked the Messenger of Allaahsall Allaahu ‘alaihi wa sallam, “Should I fast upon the journey?”

So the Prophet sall Allaahu ‘alaihi wa sallam gave him the choice between fasting and refraining from fasting, saying, “If you wish to, then fast. And if you wish, then abstain from fasting.”

(taken from Sh Uthaymeen’s explanation of ‘Umdat-ul-Ahkaam
translated by Nasser ibn Najam)

From Aboo Hurayrah radi Allaahu ‘anhu that the Prophet sall Allaahu ‘alahi wa sallam said:

Whoever forgets whilst fasting and so he eats or drinks, then let him complete his fast; for it was only Allaah who fed him and gave him drink.

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The Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah commented:

Aboo Hurayrah radi Allaahu ‘anhu informed from the Prophet sall Allaahu ‘alaihi wa sallam that he commanded the fasting person who forgets, and so eats and drinks, that he should complete his fast and continue with it, because it does not become deficient through that, in that it occurred without his choosing that.

So it is as if Allaah, the Most High, was the One who fed him and gave him drink.

And this ruling with regards to the fasting person is one example of a tremendous general principle contained in His statement, He the Most High:
O our Lord, do not take us to account if we forget or fall into error…
Soorah al Baqarah (2) aayah 286

So Allaah, the Most High, said:
Indeed I have granted it.

(taken from Sh Uthaymeen’s explanation of ‘Umdat-ul-Ahkaam
translated by Nasser ibn Najam)

From ‘Aaishah and Umm Salamah radi Allaahu ‘anhumaa:
that the dawn would come upon the Prophet sall Allaahu ‘alahi wa sallam whilst he was junub (in a state of impurity after having had sexual intercourse) from his wife, then he would make ghusl and fast.

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The Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah commented:

‘Aaishah and Umm Salamah radi Allaahu ‘anhumaa – and they were from the Mothers of the Believers and from the most knowledgeable of the people about what the Prophet sall Allaahu ‘alaihi wa sallamused to do in his house – informed that the Prophet sall Allaahu ‘alaihi wa sallam would have sexual intercourse with his wife in Ramadaan, then fast, and dawn would come upon him before he would make ghusl; so he would proceed with his fast and he would not make it up (later).

And their informing of this was in response to Marwaan ibn al Hakam when he sent someone to ask the two of them about that.

(taken from Sh Uthaymeen’s explanation of ‘Umdat-ul-Ahkaam
translated by Nasser ibn Najam)

From Anas ibn Maalik from Zayd ibn Thaabit radi Allaahu ‘anhumaa who said:

We took the suhoor with the Messenger of Allaah sall Allaahu ‘alaihi wa sallam, then he stood up for the prayer.

Anas said: “I said to Zayd, “How long was it between the adhaan (meaning the iqaamah) and the suhoor?”

He said, “The time taken (to recite) fifty aayaat.”

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The Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah commented:

Since from the goals behind taking suhoor is to strengthen the body upon fasting and preserving its energy, then it is from wisdom to delay it.

And it is that Anas ibn Maalik related from Zayd ibn Thaabit radi Allaahu ‘anhumaa that he took the suhoor in the company of the Prophet sall Allaahu ‘alaihi wa sallam in his house, then he stood up for the prayer, and there was not between the prayer and his finishing the suhoor but the length of time taken for the reciter to recite fifty medium length aayaat from the Qur-aan with a recitation that was neither rapid nor slow

(taken from Sh Uthaymeen’s explanation of ‘Umdat-ul-Ahkaam
translated by Nasser ibn Najam)

The following series of hadeeth are from the Chapter of Fasting from ‘Umdat-ul-Ahkaam (a book of hadeeth on fiqh which are ‘agreed upon’ – i.e. present in Saheeh al-Bukhaaree and Saheeh Muslim)

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From Anas ibn Maalik radi Allaahu ‘anhu who said:
The Messenger of Allaah sall Allaahu ‘alahi wa sallam said:
 
Take the suhoor (the pre dawn meal) for there is indeed blessing in the suhoor.

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The Shaykh Muhammad ibn Saalih al ‘Uthaymeen rahimahullaah commented:

In this hadeeth, Anas ibn Maalik radi Allaahu ‘anhu informed that the Prophet sall Allaahu ‘alaihi wa sallam commanded the fasting people to (take) suhoor so that they can acquire nourishment and they remain in full strength.

And he sall Allaahu ‘alaihi wa sallam made clear that there is blessing in this suhoor, clarifying that as an encouragement upon that and as an incitement upon that.

And blessing (may) be either a deeni blessing, and that is complying with the command of the Prophet sall Allaahu ‘alaihi wa sallam and taking him as an example to be followed and opposing the People of the Book (the Jews and the Christians) and what occurs as a result of that by way of reward and strength upon fasting.

Or it may be related to the dunyaa (worldly life), such as taking pleasure from the halaal food and drink which he desires and protecting one’s bodily strength and its energy.

(taken from Sh Uthaymeen’s explanation of ‘Umdat-ul-Ahkaam
translated by Nasser ibn Najam)