⁴ sn Once again the root “return” (שׁוּב, shuv) is being played on as in 3:1-4:4. See the threefold call to repentance in 3:12, 14, 22. The verb is used here four times: “repent,” “restore,” and “become” twice. He is to serve as a model of repentance, not an imitator of their apostasy. In accusing God of being unreliable he was coming dangerously close to their kind of behavior.

³ tn Heb “do not lean.” The verb שָׁעַן (shaʿan, “to lean; to rely”) is used in (1) literal physical sense of leaning upon something for support and (2) figurative sense of relying upon someone or something for help or protection (BDB 1043 s.v.). Here it functions figuratively (hypocatastasis: implied comparison); relying on one’s own understanding is compared to leaning on something that is unreliable for support (e.g., Isa 10:20).

⁴ sn The imagery of a star seems to fit the nautical theme that Jude is developing. Stars were of course the guides to sailors at night, just as teachers are responsible to lead the flock through a benighted world. But false teachers, as wayward stars, are not fixed and hence offer unreliable, even disastrous guidance. They are thus both the dangerous reefs on which the ships could be destroyed and the false guides, leading them into these rocks. There is a special irony that these lights will be snuffed out, reserved for the darkest depths of eternal darkness.

⁴ tn Heb “and all his loyalty.” The antecedent of the third masculine suffix is בָּשָׂר (basar, “flesh”), which refers collectively to mankind. The LXX, apparently understanding the antecedent as “grass,” reads “glory,” but חֶסֶד (khesed) rarely, if ever, has this nuance. The normal meaning of חֶסֶד (“faithfulness, loyalty, devotion”) fits very well in the argument. Human beings and their faithfulness (verbal expressions of faithfulness are specifically in view; cf. NRSV “constancy”) are short-lived and unreliable, in stark contrast to the decrees and promises of the eternal God.