Bakr bin Abdullah al-Muzani (may Allah have mercy on him) narrates that Sayyiduna Mughirah bin Shu'bah (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) and mentioned to him (peace and blessings be upon him) a woman to whom I wanted to propose marriage. He (peace and blessings be upon him) said: "Go and look at her, for that is more likely to keep love between the two of you." So I went to a woman of the Ansar and proposed to her through her parents, and I told them what the Prophet (peace and blessings be upon him) had said, and it was as if they disliked it. The woman heard this from behind her curtain and said: "If the Messenger of Allah (peace and blessings be upon him) has ordered you to look, then look; otherwise, I adjure you (not to)" - as if she regarded it as a very serious matter. He said: So I looked at her and married her. And the narrator also mentioned her harmony (and compatibility with her husband).
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 18176