When you tell (your brother on Friday) to be silent while the imam is giving the sermon you are guilty of idle talk.
Sunan Abi Dawud Book 2, Hadith 723
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I came to Mu'awiyah in Jerusalem. He led us in the Friday prayer. I saw that most of the people in the mosque were the Companions of the Prophet (ﷺ). I saw them sitting in ihtiba condition, i.e. sitting on hips erecting the feet and sticking them to the stomach and holding them with hands or tying them with a cloth to the back, while the imam was giving sermon.
Abu Dawud said: Ibn 'Umar used to sit in ihtiba position while the imam gave the Friday sermon. Anas b. Malik, Shuraih, Sa'sa'ah b. Sawhan, Sa'id b. al-Musayyib, Ibrahim al-Nakha'i, Makhul, Isma'il, Ismail b. Muhammad b. Sa'd, and Nu'aim b. Sulamah said: There is no harm in sitting in ihtiba position.
Abu Dawud said: I do not know whether anyone considered it disapproved except 'Ubadah b. Nasayy.
Sunan Abi Dawud Book 2, Hadith 722 Next Hadith → The Prophet (ﷺ) said: Three types of people attend Friday prayer; One is present in a frivolous way and that is all he gets from it; another comes with a supplication, Allah may grant or refuse his request as He wishes; another is present silently and quietly with-out stepping over a Muslim or annoying anyone, and that is an atonement for his sins till the next Friday and three days more, the reason being that Allah, the Exalted, says: "He who does a good deed will have ten times as much" (vi.160).
Sunan Abi Dawud Book 2, Hadith 724
Abu Dawud said: Ibn 'Umar used to sit in ihtiba position while the imam gave the Friday sermon. Anas b. Malik, Shuraih, Sa'sa'ah b. Sawhan, Sa'id b. al-Musayyib, Ibrahim al-Nakha'i, Makhul, Isma'il, Ismail b. Muhammad b. Sa'd, and Nu'aim b. Sulamah said: There is no harm in sitting in ihtiba position.
Abu Dawud said: I do not know whether anyone considered it disapproved except 'Ubadah b. Nasayy.
Sunan Abi Dawud Book 2, Hadith 722 Next Hadith → The Prophet (ﷺ) said: Three types of people attend Friday prayer; One is present in a frivolous way and that is all he gets from it; another comes with a supplication, Allah may grant or refuse his request as He wishes; another is present silently and quietly with-out stepping over a Muslim or annoying anyone, and that is an atonement for his sins till the next Friday and three days more, the reason being that Allah, the Exalted, says: "He who does a good deed will have ten times as much" (vi.160).
Sunan Abi Dawud Book 2, Hadith 724