Sayyiduna Abdur Rahman bin Samurah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) said to him: O Abdur Rahman! Do not ask for a position of authority, because if it is given to you as a result of your asking, you will be left to manage it yourself, but if it is given to you without your asking, you will be helped in it. And when you take an oath and then see something else that is better than it, then do what is better and offer expiation for your oath.
Hadith Referenceصحیح ابن حبان / كتاب السير / 4480
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - انظر ما قبله.فضيلة الشيخ العلّامة شُعيب الأرناؤوطحديث صحيح