Abdullah bin Abbas reported,

Ibrahim brought Ismail, peace be upon them both, along with Hajar, and placed them at Mecca in the spot where Zamzam now lies. The narrator mentioned the rest of the story, then said, "She came back from Marwa to Ismail, and the spring had already gushed forth. She began scooping at the spring with her hand like this until the water gathered on its side, then she would take it with her cup and pour it into her waterskin."The Messenger of Allah ﷺ said, "May Allah have mercy on her. Had she left it alone, it would have been a flowing spring streaming forth until the Day of Resurrection."

حدثنا عفان حدثنا حماد أخبرنا عطاء بن السائب عن سعيد بن جبير

عن ابن عباس

أن إبراهيم جاء بإسماعيل عليهما السلام وهاجر فوضعهما بمكة في موضع زمزم فذكر الحديث ثم جاءت من المروة إلى إسماعيل وقد نبعت العين فجعلت تفحص العين بيدها هكذا حتى اجتمع الماء من شقه ثم تأخذه بقدحها فتجعله في سقائها فقال رسول الله ﷺ يرحمها الله لو تركتها لكانت عينا سائحة تجري إلى يوم القيامة