The word "integrity" means "honesty." This speaks about integrity as if it were a person who could testify for or against another person. Alternate translation: "And later you will know if I have been honest with you or not" (See: [[rc://en/ta/man/translate/figs-personification]])
This can be stated in active form. Alternate translation: "If you find any goats without spots or any sheep that are not black, you can consider them stolen" (See: [[rc://en/ta/man/translate/figs-activepassive]])