It is narrated from Sayyiduna Abu Juhayfah (may Allah be pleased with him) that Sayyiduna Bilal (may Allah be pleased with him) came out with the leftover water of the ablution of the Prophet (peace and blessings be upon him), and the people set about getting some of it and being sprinkled with it, until a child began putting his hand beneath the armpits of the people to get some of the water.
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18470