كُلَّمَا دَخَلَ عَلَيْهَا زَكَرِيَّا الْمِحْرَابَ وَجَدَ عِنْدَهَا رِزْقًا
Whenever Zakariyyā entered her sanctuary, he found provision with her. (Qur'an 3:37)
The Qur'an describes the remarkable presence of provision with Maryam. Since she makes no prophetic claim, the event is significant in the argument for karāmāt.
The verse does not explicitly specify the kinds, seasons or quantities of fruit often mentioned in later narratives. Those details require their own evidentiary basis.