COMMENTARY on 3:37
A. Yusuf Ali:

Translation:
Right graciously did her Lord accept her: He made her grow in purity and beauty: To the care of Zakariya was she assigned. Every time that he entered (Her) chamber to seest her, He found her supplied with sustenance. He said: "O Mary! Whence (comes) this to you?" She said: "From Allah. for Allah Provides sustenance to whom He pleases without measure 379."
Commentary:

379  Mary grew under Allah's special protection. Her sustenance, under which we may include both her physical needs and her spiritual food, came from Allah, and her growth was indeed a "goodly growth" which I have tried to express in the text by the words "purity and beauty". Some aprocryphal Christian writings say that she was brought up in the Temple so the age of twelve like a dove, and that she was fed by angels.

 

Muhammad Asad:

Translation:
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. 26 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." 27
Commentary:
26  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).
27  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.