We used to fight in the holy battles in the company of the Prophet (ﷺ) and we had no wives with us. So we said, "O Allah's Messenger (ﷺ)! Shall we get castrated?" The Prophet (ﷺ) forbade us to do so.
Sahih al-Bukhari Book 67, Hadith 9
← Previous Hadith The Prophet (ﷺ) said, "The rewards (of deeds) are according to the intention, and everybody will get the reward for what he has intended. So whoever emigrated for Allah's and His Apostle's sake, his emigration was for Allah and His Apostle; and whoever emigrated for worldly benefits, or to marry a woman, then his emigration was for the thing for what he emigrated for." (1)

Sahih al-Bukhari Book 67, Hadith 8 Next Hadith → `Abdur-Rahman bin `Auf came (from Mecca to Medina) and the Prophet (ﷺ) made a bond of brotherhood between him and Sa`d bin Ar-Rabi` Al-Ansari. Al-Ansari had two wives, so he suggested that `Abdur- Rahman take half, his wives and property. `Abdur-Rahman replied, "May Allah bless you with your wives and property. Kindly show me the market." So `Abdur-Rahman went to the market and gained (in bargains) some dried yoghurt and some butter. After a few days the Prophet (ﷺ) saw `Abdur-Rahman with some yellow stains on his clothes and asked him, "What is that, O `Abdur-Rahman?" He replied, "I had married an Ansari woman." The Prophet (ﷺ) asked, "How much Mahr did you give her?" He replied, "The weight of one (date) stone of gold." The Prophet (ﷺ) said, "Offer a banquet, even with one sheep."

Sahih al-Bukhari Book 67, Hadith 10