Sunan an-Nasa'i 166

أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ عَبْدِ الْحَكَمِ، عَنْ شُعَيْبٍ، عَنِ اللَّيْثِ، قَالَ أَنْبَأَنَا ابْنُ الْهَادِ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ، عَنِ الْقَاسِمِ، عَنْ عَائِشَةَ، قَالَتْ إِنْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم لَيُصَلِّي وَإِنِّي لَمُعْتَرِضَةٌ بَيْنَ يَدَيْهِ اعْتِرَاضَ الْجَنَازَةِ حَتَّى إِذَا أَرَادَ أَنْ يُوتِرَ مَسَّنِي بِرِجْلِهِ ‏.‏

It was narrated that 'Aishah said:"The Messenger of Allah (ﷺ) used to pray when I was lying in front of him as the bier is placed (in front of the Imam), and when he wanted to pray Witr he would nudge me with his foot

Reference

Sunan an-Nasa'i 166

In-book

Book 1, Hadith 167