Sayyiduna Ali (may Allah be pleased with him) says that placing the palms of the hands over each other below the navel in prayer is Sunnah.

Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) passed by a man who was performing prayer, and he had placed his left hand over his right hand. The Prophet (peace and blessings be upon him) took out his hand and placed the right over the left.

Qabeesah bin Hulb narrates from his father, who says that the Messenger of Allah, peace and blessings be upon him, used to lead us in prayer. He would hold his left hand with his right, and after concluding the prayer (by saying salam), he would sometimes turn to the right side and sometimes to the left side.

(Second chain) He says: I saw the Messenger of Allah, peace and blessings be upon him, placing his right hand over his left in prayer, and I also saw that after finishing the prayer, he would turn to the right side as well as to the left side.

And the words of another narration are as follows: I saw the Prophet (peace and blessings be upon him) that sometimes he would turn to the right side and occasionally to the left side.

It is narrated from Sayyiduna Sahl bin Sa’d (may Allah be pleased with him) that people were instructed to place the right hand over the left hand during prayer. Abu Hazim says: I do not know except that they attributed it. Abu Abdur Rahman says: That is, when narrating it as marfu‘, they attributed it to the Noble Prophet (peace and blessings of Allah be upon him).

Sayyiduna Ghudayf bin Harith رضي الله عنه says: (Of whatever I heard or saw from you صلى الله عليه وآله وسلم), I have not forgotten anything, I have not even forgotten that I saw the Messenger of Allah صلى الله عليه وآله وسلم with his right hand placed over his left hand in prayer.

It is narrated from Sayyiduna Samurah bin Jundub (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to observe two pauses: one pause when he began the prayer, and the second, when he completed the recitation of the second surah before bowing (ruku‘). Later, when this hadith was mentioned before Sayyiduna Imran bin Husain (may Allah be pleased with him), he said: "Samurah has spoken incorrectly," and according to another narration, he said: "I do not remember such a thing from the Messenger of Allah (peace and blessings be upon him)." Then he wrote regarding this matter to Sayyiduna Ubayy bin Ka‘b (may Allah be pleased with him), who was in Madinah, and he replied that Sayyiduna Samurah (may Allah be pleased with him) had spoken the truth.

. (Second chain) When Sayyiduna Samurah bin Jundub (may Allah be pleased with him) led the people in prayer, he would observe two pauses: when he began the prayer and when he said {وَلَا الضَّالِّین}, he would also remain silent for a while. When the people objected to this, he wrote (a letter) to Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him), who replied that indeed the matter is exactly as Sayyiduna Samurah (may Allah be pleased with him) has done.

(Third chain) When Sayyiduna Samurah (may Allah be pleased with him) finished the recitation of the Surah, he would pause (remain silent).