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"When the Prophet (ﷺ) would sit during the Salat, he would place his right hand on his knee, and raise his finger, the one that is next to the [right] thumb, supplicating with it, and his left hand was spread flat on his left knee."

When the Messenger of Allah (ﷺ) sat during the prayer, he put his hands on his knees and raised the finger that is next to the thumb, and supplicates with it, and his left hand was on his knee laid on it.

It was narrated from Ibn ‘Umar that the Prophet (ﷺ) used to sit during prayer, putting his hands on his knees and raising his right finger which was next to his thumb, supplicating with it, and with his left hand (spread out) on his knee.