The Prophet ﷺ said, "May Allah have mercy on the mother of Ismail. Had she not hastened, Zamzam would have been a flowing spring."
عن النبي ﷺ قال: يرحم الله أم إسماعيل، ولولا أنها عجلت لكان زمزم عينا معينا.
Bukhari narrated it in the Book of the Prophets (3362) from Ahmad bin Saeed Abu Abdullah, who said, Wahb bin Jareer told us, from his father, from Ayub, from Abdullah bin Saeed bin Jubayr, from his father, from Ibn Abbas, and he mentioned it.