Exegesis:

kai opsetai pasa sarx ‘and all mankind shall see,’ cf. on v. 5.

pasa sarx (†; in 24.39 sarx refers to the flesh of the human body as distinct from the bones) ‘all flesh’ is in the Greek a rendering of the Hebrew kol basar, which means either ‘every living thing,’ or ‘all mankind.’ Because of the subsequent to sōtērion tou theou ‘the salvation of God’ the latter rendering is preferable.

to sōtērion tou theou ‘the salvation of God.’ For to sōtērion cf. on no direct reference to the Messiah here.

Translation:

All flesh, or, ‘all mankind,’ ‘all men/people’ (Marathi, Vai), ‘every human being,’ ‘all kinds/tribes people’ (Ekari); or ‘all that lives’ (Uab Meto, the rest of the clause restricting the meaning to human beings). An older Chinese version (UV) used a time honoured idiomatic expression, ‘all that has blood and breath,’ i.e. all living beings; a revision (RC) has ‘blood and flesh’ (cf. English “flesh and blood”), which has similar meaning.

See, or, ‘notice,’ ‘perceive,’ ‘experience’; cf. also above on 2.26.

The salvation of God, or, clarifying the function of the genitive, ‘God’s work of salvation’ (Pohnpeian, Trukese), ‘the salvation that God has wrought’ (Marathi). Shifting to a verbal clause, one may say ‘in what manner God saves people’ (Kituba), ‘how (but implying fact rather than manner) God saves people’ (cf. Manobo); the object of such a clause may also be a pronoun referring back to the term rendering “all flesh”.

Quoted with permission from Reiling, J. and Swellengrebel, J.L. A Handbook on the Gospel of Luke. (UBS Handbook Series). New York: UBS, 1971. For this and other handbooks for translators see here . Make sure to also consult the Handbook on the Gospel of Mark for parallel or similar verses.