It is narrated from Sayyiduna Suhayb (may Allah be pleased with him) that during the days of Hunayn, after praying the morning prayer, the Messenger of Allah (peace and blessings be upon him) used to move his lips with something. We said: O Messenger of Allah, you keep moving your lips with something after the morning prayer, though you did not use to do so? He (peace and blessings be upon him) said: "There was a prophet before us who was delighted by the great number of his nation, and he said: These will not last forever, and I think he said something more. So Allah, the Mighty and Majestic, revealed to him: The best of your nation face one of three things: either I set death upon them, or an enemy, or hunger. He put this before them, and they said: As for hunger, we have no strength for it, and we have no strength for an enemy, but death (we accept). So seventy thousand of them died in three days. And today I say: O Allah, by You I strive, by You I attack, and by You I fight."
Hadith Referenceالمعجم الكبير للطبراني / باب الصاد / 7287