Musnad Ahmad 28:11

Ibn Abi ‘Adi narrated to us, from Shu‘bah, from ‘Amr ibn Murrah, from ‘Abdullah ibn al-Harith, from Abu Kathir, from ‘Abdullah ibn ‘Amr ibn al-‘As, who said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Oppression is darknesses on the Day of Resurrection. Beware of obscenity, for Allah does not love obscenity, nor the seeking of it. And beware of stinginess, for stinginess destroyed those who were before you; it commanded them to sever ties, so they severed them; it commanded them to be miserly, so they were miserly; and it commanded them to commit wickedness, so they committed wickedness." He said: Then a man stood up and said: "O Messenger of Allah, which Islam is best?" He said: "That the Muslims are safe from your tongue and your hand." Then that man, or another, stood up and said: "O Messenger of Allah, which migration is best?" He said: "That you migrate from what your Lord dislikes. Migration is of two types: the migration of the dweller and the nomad. As for the nomad, his migration is that he answers when he is called, and obeys when he is commanded. And the dweller is the greater of the two in trial, and the better of the two in reward."