It is narrated from Sayyiduna Ka'b bin 'Ujrah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Whoever performs ablution at home and then leaves (for the mosque) solely for the purpose of prayer, he remains in the state of prayer until he completes the prayer. And none of you should intertwine his fingers with each other during the prayer.

It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that the Prophet of Allah, peace and blessings be upon him, said: (What is the matter with those people who raise their eyes towards the sky during prayer? Then regarding this, he spoke very sternly and said: These people must certainly refrain from doing this, or their eyes will be snatched away.)

Sayyiduna Abu Hurairah (may Allah be pleased with him) also narrates a similar tradition from the Noble Prophet (peace and blessings be upon him and his family).

A companion of the Messenger of Allah (may Allah be pleased with him) narrates that he heard the Noble Prophet (peace and blessings be upon him) say: When any one of you is in prayer, he should not raise his gaze towards the sky, lest his sight be snatched away.

It is narrated from Sayyiduna Jabir bin Samurah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When any one of you raises his head in prayer, does he not fear that perhaps his eyesight may not return to him?

It is narrated from Sayyiduna Jabir bin Samurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) entered the mosque and the people were sitting in different circles. He (peace and blessings be upon him) said: What is the reason that I see you in groups? Then he (peace and blessings be upon him) entered the mosque and saw that the people had raised their hands (in prayer) like the tails of unruly horses. He (peace and blessings be upon him) said: Observe calmness in prayer.

Sayyiduna Abdur Rahman bin Shibl Ansari (may Allah be pleased with him) says: Verily, the Messenger of Allah (peace and blessings be upon him) forbade three things in prayer: pecking like a crow, spreading (the hands) like a beast of prey, and for a man to designate a specific spot in the mosque like a camel.

(Second chain) He said: I heard the Messenger of Allah, peace and blessings be upon him, forbidding three things: pecking like a crow, spreading the arms like a beast, and that a man designates a place for prayer as a camel does. That he designates a place for standing in prayer as a camel designates.

Urwah reports that Sayyiduna Abdullah bin Arqam (may Allah be pleased with him) performed Hajj. During this journey, he would give the call to prayer (adhan) and lead his companions in prayer. One day, he stood up to lead the prayer, but then said: "Let one of you lead the prayer, for I heard the Messenger of Allah (peace and blessings be upon him) say: When any of you intends to relieve himself and the prayer has been established, he should relieve himself first."

Sayyiduna Abu Umamah (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) saying: None of you should approach prayer in a state when he is restraining stool or urine, and one should not enter a house without permission, and no imam should lead a people in prayer in such a way that he singles out himself in supplication, leaving them out.