Sunan an-Nasa'i, Book 26, Hadith 39 (In-Book) ⓘ
Narrated Abu Hurairah: It was narrated that Abu Hurairah said: "A man proposed to a woman from among the Ansar and the Messenger of Allah said to him: 'Have you seen her?' He said: 'No.' So he told him to look at her."
أَخْبَرَنَا عَبْدُ الرَّحْمَنِ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا مَرْوَانُ، قَالَ حَدَّثَنَا يَزِيدُ، - وَهُوَ ابْنُ كَيْسَانَ - عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ خَطَبَ رَجُلٌ امْرَأَةً مِنَ الأَنْصَارِ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " هَلْ نَظَرْتَ إِلَيْهَا " . قَالَ لاَ . فَأَمَرَهُ أَنْ يَنْظُرَ إِلَيْهَا .
also referenced under: Hadith 3234 (Reference) & Volume 4, Book 26, Hadith 3236 (DarusSalam)