سنن النسائي

It was narrated that Abu Qibalah said: "Malik bin Al-Huwairith used to come to us and say: "Shall I not tell you about the prayer of the Messenger of Allah (ﷺ)?" He was praying at a time other than the time of prayer, and when he raised his head from the second prostration in the first rak'ah, he settled in a seated position, then he stood up, and he supported himself on the ground (while doing so)."