[4:2] 1 tn Here the Hebrew word צְדָקָה (tsÿdaqah), usually translated “righteousness” (so KJV, NIV, NRSV, NLT; cf. NAB “justice”), has been rendered as “vindication” because it is the vindication of God’s people that is in view in the context. Cf. BDB 842 s.v. צְדָקָה 6; “righteousness as vindicated, justification, salvation, etc.”
[4:2] 2 sn The point of the metaphor of healing wings is unclear. The sun seems to be compared to a bird. Perhaps the sun’s “wings” are its warm rays. “Healing” may refer to a reversal of the injury done by evildoers (see Mal 3:5).