I went to Allah's Messenger (ﷺ) along with a group of people from (the tribe of) Al-Ash`ari, asking for
mounts. The Prophet (ﷺ) said, "By Allah, I will not give you anything to ride, and I have nothing to mount
you on." We stayed there as long as Allah wished, and after that, some camels were brought to the
Prophet and he ordered that we be given three camels. When we set out, some of us said to others,
"Allah will not bless us, as we all went to Allah's Messenger (ﷺ) asking him for mounts, and although he had
sworn that he would not give us mounts, he did give us." So we returned to the Prophet; and
mentioned that to him. He said, "I have not provided you with mounts, but Allah has. By Allah, Allah
willing, if I ever take an oath, and then see that another is better than the first, I make expiration for
my (dissolved) oath, and do what is better and make expiration."
Sahih al-Bukhari Book 84, Hadith 11
The Prophet (ﷺ) said, "Do you think if the tribes of Aslam, Ghifar, Muzaina and Juhaina are better than
the tribes of Tamim, 'Amir bin Sa'sa'a, Ghatfan and Asad, they (the second group) are despairing and
losing?" They (the Prophet's companions) said, "Yes, (they are)." He said, "By Him in Whose Hand
my soul is, they (the first group) are better than them (the second group).
Sahih al-Bukhari Book 83, Hadith 14