Musnad Ahmed: Hadith 4243

Ibn Mas’ood was met by 'Uthman in 'Arafah. He sat on his own with him and talked to him, then 'Uthman said to Ibn Mas'ood: What do you think of a girl I will give to you in marriage? 'Abdullah bin Mas'ood called ‘Alqamah and he told him that the Prophet (ﷺ) said: "O young men, whoever among you can afford it, let him get married, for it is more effective in lowering the gaze and guarding one's chastity, And whoever cannot afford it should fast, for it will be a shield for him."