Sahih al-Bukhari 5091
Wedlock, Marriage (Nikaah)
Husband and wife should have the same religion
Narrated Sahl: A man passed by Allah's Messenger (ﷺ) and Allah s Messenger asked (his companions) "What do you say about this (man)?" They replied "If he asks for a lady's hand, he ought to be given her in marriage; and if he intercedes (for someone) his intercessor should be accepted; and if he speaks, he should be listened to." Allah's Messenger (ﷺ) kept silent, and then a man from among the poor Muslims passed by, an Allah's Messenger (ﷺ) asked (them) "What do you say about this man?" They replied, "If he asks for a lady's hand in marriage he does not deserve to be married, and he intercedes (for someone), his intercession should not be accepted; And if he speaks, he should not be listened to.' Allah's Messenger (ﷺ) said, "This poor man is better than so many of the first as filling the earth.'