Musnad Ahmed: Hadith 4086

We were with The Messenger of Allah (ﷺ) and we were young men. We said: O Messenger of Allah, can we not castrate ourselves? But he forbade us to do that. Then after that we were granted a concession allowing us to marry a woman in return for a garment for a limited time. Then Abdullah recited: "Make not unlawful the Tayyibat (all that is good as regards foods, things, deeds, beliefs, persons) which Allah has made lawful to you.” (al-Ma’idah 5:87).