Wadah bin 'Abdullah al-Yashkari وضاح بن عبد الله اليشكري أبو عوانة · The Book of Forgetfulness (In Prayer)

"The Messenger of Allah (ﷺ) said the salam then he performed two prostrations of forgetfulness while he was still sitting, then he said the salam." He said: He mentioned it in the hadith of Dhul-Yadain.

"When the Messenger of Allah (ﷺ) prayed fajr, he would sit in the place where he had prayed until the sun rose."