كتاب النكاح
Read the English translation first, with the original Arabic directly underneath.
Narrated 'Alqamah:
It was narrated from 'Alqamah, that 'Uthman said to Ibn Mas'ud: "Shall I arrange for you to marry a young girl?" 'Abdullah called 'Alqamah and he told the people that the Prophet (ﷺ) said: "Whoever among you can afford it, let him get married, for it is more effective in lowering the gaze and guarding chastity. And whoever cannot afford it, then let him fast, for it will be a restraint for him."
مَنِ اسْتَطَاعَ الْبَاءَةَ فَلْيَتَزَوَّجْ فَإِنَّهُ أَغَضُّ لِلْبَصَرِ وَأَحْصَنُ لِلْفَرْجِ وَمَنْ لَمْ يَسْتَطِعْ فَلْيَصُمْ فَإِنَّهُ لَهُ وِجَاءٌ