Sunan Abi Dawud Book 2, Hadith 342
“When he prostrated himself he neither placed his arms on the ground nor closed them; putting forward his fingers towards the qiblah.”
I (once) attended the meeting of the companions of the Messenger of Allah(ﷺ). They began to discuss his prayer. Abu Humaid then narrated a part of the same tradition and said: When he bowed he clutched his knees with his palms, and he opened his fingers; then he bent his back without raising his upwards, and did not turn his face (on any side). When he sat at the end of two rak’ahs he sat on the sole of his left foot and raised the right, and after the fourth he placed his left hip on the ground and spread out both his feet one side.
He then raised his head after bowing and uttered:”Allah listens to him who praises Him, to Thee, our Lord, be the praise,” and raised his hands. He then uttered: “Allah is most great”; then he prostrated himself and rested on his palms, knees, and the end of his toes while prostrating: then he uttered the Takbir (Allah is most great), and sat down on his hips and raised his other foot; then he uttered the takbir and prostrated himself; then he uttered takbir and stood up, but did not sit on his hips. He (the narrator) then narrated the rest of the tradition. He further said: Then he sat down at the end of two rak’ahs; when he was about to stand after two rak’ahs, he uttered the takbir; then he offered the last two rak’ahs of the prayer. The narrator did not mention about his sitting on the hips spreading out his feet.