Where would Joseph Smith have read that not only Enoch but his whole city were translated?

The Book of Moses deviates from the Biblical account of Enoch by claiming the whole city was translated. Moses 7:69 reads:

And Enoch and all his people walked with God, and he dwelt in the midst of Zion; and it came to pass that Zion was not, for God received it up into his own bosom; and from thence went forth the saying, Zion is Fled.

Jeffrey M. Bradshaw explains how this is supported by non-biblical texts:

Genesis implies that Enoch escaped death by being taken up alive into heaven. In a significant addition to the biblical record, the Book of Moses states that not only Enoch but his entire city was eventually received up into heaven. Two late accounts preserve echoes of a similar motif. In Adolph Jellenik’s translation of Jewish traditions, Bet ha-Midrasch, we find the account of a group of Enoch’s followers who steadfastly refused to leave him as he journeyed toward the place where he was going to be taken up to heaven. Afterward, a group of kings came to find out what happened to these people. After searching under large blocks of snow they unexpectedly found at the place, they failed to discover any remains of Enoch or of his followers. In a Mandaean Enoch fragment, a group of the prophet’s adversaries complain that Enoch and those who had gone to heaven with him have escaped their reach: “By fleeing and hiding the people on high have ascended higher than us. We have never known them. All the same, there they are, clothed with glory and splendors. … And now they are sheltered from our blows.”
In addition to these accounts alluding to a group who rose with Enoch to heaven, David Larsen provides a valuable discussion that includes “examples in early Jewish and early Christian literature that depict this motif in a different way. Although they do not feature Enoch or his city explicitly, there is a recurring theme in some of the texts that corresponds to the idea of a priestly figure who leads a community of priests in an ascension into the heavenly realm.”
– Jeffrey M. Bradshaw – KnoWhy OTL05C — Could Joseph Smith Have Drawn On Ancient Manuscripts When He Translated the Story of Enoch?

Why wouldn’t Joseph Smith stay true to the biblical account if he was trying to convince everyone the Book of Moses was scripture?

See:

Jeffrey M. Bradshaw – KnoWhy OTL05C — Could Joseph Smith Have Drawn On Ancient Manuscripts When He Translated the Story of Enoch?

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