Mosques and places of Prayer - Section 2 Mishkat al-Masabih 730
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ أَتَى الْمَسْجِدَ لِشَيْءٍ فَهُوَ حَظُّهُ» . رَوَاهُ أَبُو دَاوُد
Translation
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.