Jamieson, Fausset and Brown on Song of Solomon 5:10

10. (1Pe 3:15).

white and ruddy--health and beauty. So David (equivalent to beloved), His forefather after the flesh, and type (1Sa 17:42). "The Lamb" is at once His nuptial and sacrificial name (1Pe 1:19; Re 19:7), characterized by white and red; white, His spotless manhood (Re 1:14). The Hebrew for white is properly "illuminated by the sun," white as the light" (compare Mt 17:2); red, in His blood-dyed garment as slain (Is 63:1-3; Re 5:6; 19:13). Angels are white, not red; the blood of martyrs does not enter heaven; His alone is seen there.

chiefest--literally, "a standard bearer"; that is, as conspicuous above all others, as a standard bearer is among hosts (Psa 45:7; 89:6; Is 11:10; 55:4; He 2:10; compare 2Sa 18:3; Job 33:23; Php 2:9-11; Re 1:5). The chief of sinners needs the "chiefest" of Saviours.