Mishkat al-Masabih #953
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ نَافِعٍ قَالَ: إِنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ مَرَّ عَلَى رَجُلٍ وَهُوَ يُصَلِّي فَسَلَّمَ عَلَيْهِ فَرَدَّ الرَّجُلُ كَلَامًا فَرَجَعَ إِلَيْهِ عَبْدُ اللَّهِ بْنُ عُمَرَ فَقَالَ لَهُ: إِذَا سُلِّمَ عَلَى أَحَدِكُمْ وَهُوَ يُصَلِّي فَلَا يَتَكَلَّمْ وَلْيُشِرْ بِيَدِهِ. رَوَاهُ مَالك
Nafi' said that ‘Abdallah b. ‘Umar passed a man while he was praying and gave him a salutation to which the man uttered some words in reply. ‘Abdallah b. ‘Umar went back to him and said to him, “When one of you is greeted while he is engaged in prayer he must not speak, but give a sign with his hand.”
Malik transmitted it.
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About Mishkat al-Masabih
This hadith is #953 from Mishkat al-Masabih, in the Book of Prayer.