Mishkat al-Masabih 3 Purification كتاب الطهارة 80

وَعَن أبي أَيُّوب وَجَابِر وَأنس: أَن هَذِه الْآيَة نَزَلَتْ (فِيهِ رِجَالٌ يُحِبُّونَ أَنْ يَتَطَهَّرُوا وَاللَّهُ يحب المطهرين) قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «يَا مَعْشَرَ الْأَنْصَارِ إِنَّ اللَّهَ قَدْ أَثْنَى عَلَيْكُمْ فِي الطَّهُورِ فَمَا طَهُورُكُمْ قَالُوا نَتَوَضَّأُ لِلصَّلَاةِ وَنَغْتَسِلُ مِنَ الْجَنَابَةِ وَنَسْتَنْجِي بِالْمَاءِ قَالَ فَهُوَ ذَاك فعليكموه» . رَوَاهُ ابْن مَاجَه

Abu Ayyub, Jabir and Anas said that when this verse came down, “In it are men who love to be purified, and God loves those who purify themselves,”* God’s messenger said, “God has praised you Ansar for purification. What does your purification consist of?” They replied, “We perform ablution for prayer, wash after seminal emission, and cleanse ourselves with water.” He said, “That is it, so keep on doing it.” *1. Qur’an, ix, 108. Ibn Majah transmitted it.