Silsilat al-Ahadith al-Sahihah

It is narrated from Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "When Jibreel (peace be upon him) pressed his heel to bring forth the water of Zamzam, the mother of Isma'il (peace be upon him) began to gather it by making a basin in the wide valley." The Noble Prophet (peace and blessings be upon him) said: "May Allah have mercy on Umm Isma'il, Hajar. If she had left the water (as it was), it would have become a flowing spring."