Sayyiduna Abu Sa‘id Khudri (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "How can I be unconcerned while Israfil (peace be upon him) has placed the trumpet to his mouth, lowered his forehead, and is waiting for the command as to when he will be ordered and he will blow into it?" The Companions (may Allah be pleased with them) asked: O Messenger of Allah! What do you command us to do then? He (peace and blessings be upon him) said: "Say: «حسبنا اللہ ونعم الوکیل» Allah is sufficient for us and He is the best disposer of affairs."
Related hadith on this topic