Verses with the word whiter in the Old Testament (2 verses):

Psalms 51:7
Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.

Lamentations 4:7
Her Nazarites were purer than snow, they were whiter than milk, they were more ruddy in body than rubies, their polishing was of sapphire: