Anas bin Malik said: “I heard the Messenger of Allah say: 'Whoever wants to meet Allah pure and purified, let him marry free women.' ”  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ مَنْ أَرَادَ أَنْ يَلْقَى اللَّهَ طَاهِرًا مُطَهَّرًا فَلْيَتَزَوَّجِ الْحَرَائِرَ  

the Messenger of Allah said: “Marry, for I will boast of your great numbers.”  

قَالَ رَسُولُ اللَّهِ ﷺ انْكِحُوا فَإِنِّي مُكَاثِرٌ بِكُمْ