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Jabir reported God’s Messenger as saying, “When one of you asks a woman in marriage, if he is able to look at what will induce him to marry her, he should do so.” Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
عَنْ جَابِرٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا خَطَبَ أَحَدُكُمُ الْمَرْأَةَ فَإِنِ اسْتَطَاعَ أَنْ يَنْظُرَ إِلَى مَا يَدْعُوهُ إِلَى نِكَاحهَا فَلْيفْعَل» . رَوَاهُ أَبُو دَاوُد
sunnah.com