كتاب النكاح
16
The Book of Marriage
(12)
Chapter: It is recommended for the one who wants to marry a woman to look at her face and hands before proposing marriage to her
(12)
باب نَدْبِ النَّظَرِ إِلَى وَجْهِ الْمَرْأَةِ وَكَفَّيْهَا لِمَنْ يُرِيدُ تَزَوُّجَهَا ‏
Sahih Muslim 1424 b

Abu Huraira (Allah be pleased with him) reported:

A man came to Allah's Messenger (ﷺ) and said: I have contracted marriage with a woman of the Ansar, whereupon Allah's Apostle (ﷺ) said: Did you cast a glance at her, for there is something in the eyes of the Ansar? He said: I did cast a glance at her, whereupon he said: For what (dower) did you marry her? He said: For four 'uqiyas. Thereupon Allah's Apostle (ﷺ) said: For four 'uqiyas; it seems as if you dig out silver from the side of this mountain (and that is why you are prepared to pay such a large amount of dower). We have nothing which we should give you. There is a possibility that we may send you to an (expedition) where you may get (booty). So he sent that man (in the expedition) which was despatched to Banu 'Abs.
وَحَدَّثَنِي يَحْيَى بْنُ مَعِينٍ، حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ الْفَزَارِيُّ، حَدَّثَنَا يَزِيدُ بْنُ كَيْسَانَ، عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ جَاءَ رَجُلٌ إِلَى النَّبِيِّ صلى الله عليه وسلم فَقَالَ إِنِّي تَزَوَّجْتُ امْرَأَةً مِنَ الأَنْصَارِ ‏.‏ فَقَالَ لَهُ النَّبِيُّ صلى الله عليه وسلم ‏"‏ هَلْ نَظَرْتَ إِلَيْهَا فَإِنَّ فِي عُيُونِ الأَنْصَارِ شَيْئًا ‏"‏ ‏.‏ قَالَ قَدْ نَظَرْتُ إِلَيْهَا ‏.‏ قَالَ ‏"‏ عَلَى كَمْ تَزَوَّجْتَهَا ‏"‏ ‏.‏ قَالَ عَلَى أَرْبَعِ أَوَاقٍ ‏.‏ فَقَالَ لَهُ النَّبِيُّ صلى الله عليه وسلم ‏"‏ عَلَى أَرْبَعِ أَوَاقٍ كَأَنَّمَا تَنْحِتُونَ الْفِضَّةَ مِنْ عُرْضِ هَذَا الْجَبَلِ مَا عِنْدَنَا مَا نُعْطِيكَ وَلَكِنْ عَسَى أَنْ نَبْعَثَكَ فِي بَعْثٍ تُصِيبُ مِنْهُ ‏"‏ ‏.‏ قَالَ فَبَعَثَ بَعْثًا إِلَى بَنِي عَبْسٍ بَعَثَ ذَلِكَ الرَّجُلَ فِيهِمْ ‏.‏
Reference : Sahih Muslim 1424 b
In-book reference : Book 16, Hadith 88
USC-MSA web (English) reference : Book 8, Hadith 3315
  (deprecated numbering scheme)