مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 730
Prayer
Mosques and places of Prayer - Section 2
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَتَى الْمَسْجِدَ لِشَيْءٍ فَهُوَ حَظُّهُ» . رَوَاهُ أَبُو دَاوُد
He also reported God’s Messenger as saying, “If anyone comes to a mosque for a purpose, he will attain it.” Abu Dawud transmitted it.
Mishkat al-Masabih, 730حَسَنٍ (الألباني)