Mishkat al-Masabih #72
Faith
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنِ الْقَاسِمِ بْنِ مُحَمَّدٍ أَنَّ رَجُلًا سَأَلَهُ فَقَالَ: «إِنِّي أهم فِي صَلَاتي فيكثر ذَلِك عَليّ فَقَالَ الْقَاسِم بن مُحَمَّد امْضِ فِي صَلَاتك فَإِنَّهُ لن يذهب عَنْكَ حَتَّى تَنْصَرِفَ وَأَنْتَ تَقُولُ مَا أَتْمَمْتُ صَلَاتي» . رَوَاهُ مَالك
Al-Qasim b. Muhammad said that a man told him he was greatly distressed by wandering thoughts while he was engaged in prayer. He told him to persevere with his prayer, explaining that he would not be free from that till he said when he finished his prayer, “I have not performed my prayer perfectly.”
Malik transmitted it.
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About Mishkat al-Masabih
This hadith is #72 from Mishkat al-Masabih, in the Book of Faith.