Abdullah bin Umar reported,

A man came to the Prophet ﷺ and asked him about the night prayer, and I was standing between the questioner and the Prophet ﷺ.He said, "Two by two, and when you fear the approach of dawn, pray a single rakah as witr."Then the man came again at the turn of the year, and I was in that same position between him and the questioner. He asked him the same question.He said, "Two by two, and when you fear the approach of dawn, pray a single rakah as witr."

Ahmad 5217

Sahih

حدثنا وكيع حدثنا عمران بن حدير عن عبد الله بن شقيق العقيلي

عن ابن عمر قال

جاء رجل إلى النبي ﷺ فسأله عن صلاة الليل وأنا بين السائل وبين النبي ﷺ فقال مثنى مثنى فإذا خشيت الصبح فأوتر بركعة قال ثم جاء عند قرن الحول وأنا بذاك المنزل بينه وبين السائل فسأله فقال مثنى مثنى فإذا خشيت الصبح فأوتر بركعة

أحمد 5217صحيح
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abdullah bin Umar
Numbering
Darussalam 5217
Ahmad 5217