Sayyiduna Usamah bin Sharik (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) while people were asking him questions. One would say: I shaved my head before offering the sacrifice; and another would say: I did such-and-such earlier. And the Messenger of Allah (peace and blessings be upon him) kept saying: "There is no harm, there is no harm."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 473