Sunan an-Nasa'i 1220

Muhammad ibn ‘Abd Allah ibn ‘Ammar reported to us; he said: Ibn Abi Ghaniyyah—whose name was Yahya ibn ‘Abd al-Malik—and al-Qasim ibn Yazid al-Jarmi reported to us, from Sufyan, from al-Zubayr ibn ‘Adi, from Kulthum, from ‘Abd Allah ibn Mas‘ud. This is al-Qasim’s version. He said: I used to come to the Prophet (ﷺ) while he was praying and greet him, and he would return my greeting. Then I came to him and greeted him while he was praying, but he did not return my greeting. When he had said the taslim, he gestured to the people and said: “Allah, the Mighty and Majestic—I mean, He has established in prayer that you are not to speak except in remembrance of Allah and what is proper for you, and that you stand before Allah devoutly.”