I believe you heard that Abu ‘Ubaydah has returned from Bahrain with something

The Prophet (may Allah's peace and blessings be upon him) sent Abu ‘Ubaydah (may Allah be pleased with him) to Bahrain to collect the tax from them. When he returned to Madīnah and the Ansār heard about his return, they went to the Prophet and gathered waiting for him at the Fajr prayer. After the Prophet prayed and started to leave, the Ansār presented themselves to him and he smiled because he knew they wanted some of the money. He said to them: "Perhaps you've heard that Abu ‘Ubaydah has returned?" They said: "Yes, O Messenger of Allah," meaning we have come to receive our share of the money. So the Prophet gave them glad tidings that made them happy. He informed them that he does not fear poverty for them, because most of the time the impoverished person is closer to the truth than the wealthy one. Rather, he feared for them that the pleasures of the worldly life would be given to them, and then they would compete among themselves to attain them. A person in such a state (of competition) is never satisfied with what he has and he always wants more and more by any means. He does not care whether he acquires it through lawful or unlawful means. There is no doubt that this is a type of dispraised competition which attaches the person to this world and distances him from the Hereafter (and remembrance of it). So, as a result, the person is destroyed just as the previous nations were destroyed for the same reason.