"... Both the Greek and Latin texts render the first verb in the active (“and he arose”), which emphasizes the child’s capacity to act alone from the start. In place of the Ethiopic “and spoke”, the Greek has “and blessed” (which is supported by the double rendering in the Lat.). The Greek version has perhaps influenced the description of Melchizedek just after his miraculous birth in 2 Enoch 71:18 (recensions A and J): “he spoke with his lips and blessed the Lord” (as in the present text, the verbs of praising are active). As it stands, the second half of the lemma – so also the text in 106:11 – is an allusion to Psalm 51:15: “O Lord, open my lips, and my mouth will declare your praise”. The cultic context of the psalmic text (compare Psalm 51:16–19) is carries over into priestly overtones in later passages which allude to it; see especially 4Q418 81.1 (“he has opened my lips as a source to bless the holy ones”) and Luke 1:64 (“his mouth was opened and his tongue freed, and he began to speak, praising God”). Similarly, in the passage just cited from 2 Enoch 71, the speech of the newborn Melchizedek is followed by the identification of him as a priest (verses 19–22). Priestly overtones for Noah are less prominent in Birth of Noah, though not entirely absent, as the comparison between the child and “the angels of heaven” may imply (1 Enoch 106:5, 6, 12) ..."

Stuckenbruck, Loren T. 1 Enoch 91-108 (p. 629) De Gruyter, 2007