Job 31:5

If I have walked with vanity - This is the second specification in regard to his private deportment. He says that his life had been sincere, upright, honest. The word vanity here is equivalent to falsehood, for so the parallelism demands, and so the word (שׁוא shâv') is often used; Psalms 12:3; Psalms 41:7; Exodus 23:1; Deuteronomy 5:20; compare Isa, Deuteronomy 1:13. The meaning of Job here is, that he had been true and honest. In his dealings with others he had not defrauded them; he had not misrepresented things; he had spoken the exact truth, and had done that which was without deception or guile.

If my foot hath hasted to deceit - That is, if I have gone to execute a purpose of deceit or fraud. He had never, on seeing an opportunity where others might be defrauded, hastened to embrace it. The Septuagint renders this verse, “If I have walked with scoffers - μετα γελοιαστῶν meta geloiastōn - and if my foot has hastened to deceit.”