Mishkat al-Masabih #1084
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَن أبي سعيد الْخُدْرِيّ قَالَ: جَاءَ رَجُلٌ وَقَدْ صَلَّى رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «أَلَا رَجُلٌ يَتَصَدَّقُ عَلَى هَذَا فَيُصَلِّيَ مَعَهُ؟» فَقَامَ رَجُلٌ فيصلى مَعَه ". رَوَاهُ التِّرْمِذِيّ وَأَبُو دَاوُد
Abu Sa'id al-Khudri told how a man came when God’s Messenger had already prayed, and he said, “Will no one give alms* to this man and pray along with him?” Thereupon a man got up and prayed along with him.
* This is a literal translation. The idea is that by joining with him he increased the reward the man would receive for his prayer, as prayer in company has a much greater reward than prayer alone.
Tirmidhi and Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #1084 from Mishkat al-Masabih, in the Book of Prayer.