The Quran

فَتَقَبَّلَها رَبُّها بِقَبولٍ حَسَنٍ وَأَنبَتَها نَباتًا حَسَنًا وَكَفَّلَها زَكَرِيّا ۖ كُلَّما دَخَلَ عَلَيها زَكَرِيَّا المِحرابَ وَجَدَ عِندَها رِزقًا ۖ قالَ يا مَريَمُ أَنّىٰ لَكِ هٰذا ۖ قالَت هُوَ مِن عِندِ اللَّهِ ۖ إِنَّ اللَّهَ يَرزُقُ مَن يَشاءُ بِغَيرِ حِسابٍ

Muhammad Asad

And thereupon her Sustainer accepted the girl-child with goodly acceptance, and caused her to grow up in goodly growth, and placed her in the care of Zachariah.¹ Whenever Zachariah visited her in the sanctuary, he found her provided with food. He would ask: "O Mary, whence came this unto thee?" She would answer: "It is from God; behold, God grants sustenance unto whom He wills, beyond all reckoning."²

As is evident from verse 44 of this surah, the guardianship of Mary was entrusted to Zachariah - who was not only her relative but also a priest attached to the Temple - after lots had been drawn to decide which of the priests should have the responsibility for this girl who, in consequence of her mother's vow, was to be dedicated to Temple service (Tabari).
In spite of all the legends quoted in this connection by most of the commentators, there is no indication whatsoever either in the Qur'an or in any authentic Tradition that these provisions were of a miraculous origin. On the other hand, Tabari quotes a story to the effect that when, in his old age, Zachariah became unable to support Mary by his own means, the community decided to assume this responsibility through another of its members, who thereupon provided her daily with food. Whether this story is authentic or not, Mary's answer to Zachariah reflects no more and no less than her deep consciousness of God as the ultimate Provider.