The most excellent prayer is that in which the duration of standing is longer.
Sahih Muslim Book 6, Hadith 197
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He who amongst you is afraid that he may not be able to get up at the end of the night should observe Witr (in the first part) and then sleep, and he who is confident of getting up and praying at night (i. e. Tahajjud prayer) should observe it at the end of it, for the recitation at the end of the night is witnessed*, and that is better.
*: meaning, "by angels" (Sharh an-Nawawi)
Sahih Muslim Book 6, Hadith 196 Next Hadith → The Messenger of Allah (ﷺ) was asked about the prayer which was most excellent. He said: That in which the standing is longer. (This hadith is narrated by another chain of transmitters too.)
Sahih Muslim Book 6, Hadith 198
*: meaning, "by angels" (Sharh an-Nawawi)
Sahih Muslim Book 6, Hadith 196 Next Hadith → The Messenger of Allah (ﷺ) was asked about the prayer which was most excellent. He said: That in which the standing is longer. (This hadith is narrated by another chain of transmitters too.)
Sahih Muslim Book 6, Hadith 198