Allah's Messenger (ﷺ) said, "The Prophet (ﷺ) Abraham migrated with Sarah. The people (of the town where they migrated) gave her Ajar (i.e. Hajar). Sarah returned and said to Abraham, "Do you know that Allah has humiliated that pagan and he has given a slave-girl for my service?"
Sahih al-Bukhari Book 51, Hadith 67
← Previous Hadith That he was told by the most learned one amongst them (i.e. Ibn `Abbas) that the Prophet (ﷺ) went towards some land which was flourishing with vegetation and asked to whom it belonged. He was told that such and such a person took it on rent. The Prophet (ﷺ) said, "It would have been better (for the owner) if he had given it to him gratis rather than charging him a fixed rent.

Sahih al-Bukhari Book 51, Hadith 66 Next Hadith → Once I gave a horse (for riding) in Allah's Cause. Later I saw it being sold. I asked Allah's Messenger (ﷺ) (whether I could buy it). He said, "Don't buy it, for you should not get back what you have given in charity."

Sahih al-Bukhari Book 51, Hadith 68