(The established way of folding hands is) to hold the hands by the hands in prayer below the navel.

Abu Dawud said: I heard Ahmad b. Hanbal say: The narrator 'Abd al-Rahman b. Ishaq al-Kufi is weak (i.e. not reliable).

The Messenger of Allah (ﷺ) used to place his right hand on his left hand, then he folded them strictly on his chest in prayer.

When the Messenger of Allah (ﷺ) stood up for prayer, he uttered the takbir (Allah is most great), then said: I have turned my face, breaking with all others, towards Him Who created the heavens and the earth, and I am not a polytheist. My prayer and my devotion, my life and my death belong to Allah, the Lord of the Universe, Who has no partner. That is what I have been commanded, and I am first of Muslims (those who surrender themselves). O Allah, Thou art the King. There is no God but Thee. Thou art my Lord and I am Thy servant. I have wronged myself, but I acknowledge my sin, so forgive me all my sins; Thou Who alone canst forgive sins; and guide me to the best qualities. Thou Who alone canst guide to the best of them; and turn me from evil ones. Thou who alone canst turn from evil qualities. I come to serve and please Thee. All good is in Thy Hands, and evil does not pertain to Thee. I seek refuge in Thee and turn to Thee, Who art blessed and exalted. I ask Thy forgiveness and turn to thee in repentance. When he bowed, he said: O Allah, to Thee I bow, in Thee I trust, and to Thee I submit myself. My hearing, my sight, my brain, my bone and my sinews humble themselves before Thee. When he raised his head, he said: Allah listens to him who praises Him. O our lord, and all praises be to Thee in the whole of the heavens and the earth, and what is between them, and in whatever Thou creates afterwards. When he prostrated himself, he said: O Allah, to Thee I prostrate myself, to Thee I trust, and to Thee I submit myself. My face prostrated itself before Him Who created it, fashioned it, and fashioned it in the best shape, and brought forth its hearing and seeing. Blessed is Allah, the best of creators. When he saluted at the end of the prayer, he said: O Allah, forgive me my former and my latter sins, my open and secret sins, my sins in exceeding the limits, and what Thou knowest better than I. Thou art He Who puts forward and puts back. There is deity but Thee.

When the Messenger of Allah (ﷺ) stood up for (offering) obligatory prayer, he uttered the takbir (Allah is most great) and raised his hands opposite to his shoulders, and he did so when he finished the recitation (of the Qur’an) and when he was about to bow; and he did like that when he raised (his head) after bowing. He did not raise his hands in prayer when he was sitting. When he stood at the end of two rak’ahs, he raised his hands in a similar way and uttered the takbir and supplicated in a more or less the same manner as narrated by ‘Abd al-‘Aziz in his version. This version does not mention the words “All good is in Thy Hands and evil does not pertain to Thee.” And this adds: He said when he finished the prayer: “O Allah, forgive me my former and latter sins, my open and secret sins; Thou art my deity; there is no God but Thee.