She reported to them, saying: We came upon the Messenger of Allah (ﷺ). My companion, Hurayth ibn Hassan, came to him as a delegate from Bakr ibn Wa'il. He took the oath of allegiance of Islam for himself and for his people.
He then said: Messenger of Allah (ﷺ), write a document for us, giving us the land lying between us and Banu Tamim at ad-Dahna' to the effect that not one of them will cross it in our direction except a traveller or a passer-by.
He said: Write down ad-Dahna' for them, boy. When I saw that he passed orders to give it to him, I became anxious, for it was my native land and my home.
I said: Messenger of Allah, he did not ask you for a true border when he asked you. This land of Dahna' is a place where the camels have their home, and it is a pasture for the sheep. The women of Banu Tamim and their children are beyond it.
He said: Stop, boy! A poor woman spoke the truth: a Muslim is a brother of a Muslim. Each one of them may benefit from water and trees, and they should cooperate with each other against Satan.
In-book : Book 20, Hadith 143
English translation : Book 19, Hadith 3064