וְעָֽנְתָה־בִּ֤י צִדְקָתִי֙ בְּי֣וֹם מָחָ֔ר כִּֽי־תָב֥וֹא עַל־שְׂכָרִ֖י לְפָנֶ֑יךָ כֹּ֣ל אֲשֶׁר־אֵינֶנּוּ֩ נָקֹ֨ד וְטָל֜וּא בָּֽעִזִּ֗ים וְחוּם֙ בַּכְּשָׂבִ֔ים גָּנ֥וּב ה֖וּא אִתִּֽי׃
Así responderá por mí mi justicia mañana cuando me viniere mi salario delante de ti: toda la que no fuere pintada ni manchada en las cabras y de color oscuro en las ovejas mías, se me ha de tener por de hurto.
Rashi
'וענתה בי וגו AND MY RIGHTEOUSNESS SHALL ANSWER FOR ME etc. — Should you suspect me of taking any animals that are yours my righteousness will answer for me, — for my righteousness will come and bear witness before thee as to my hire that you will find in my herd only speckled and spotted ones. Whatever, however, you find amongst them (amongst the animals) that is not speckled or spotted or brownish it will be certain that I have stolen it from your flocks and that it is in my possession by way of theft.
Radak
וענתה בי צדקתי, this will prove that I dealt fairly with you, and will continue to deal fairly with you. My righteousness will be proved by the fact that animals with such skin patterns will be born though their mother animals or their fathers did not possess these skin patterns, so that I did not benefit by genetic factors contributed by your animals. Not only had Lavan removed all animals with traces of such skin patterns from the flocks entrusted to Yaakov for tending, but even animals which had displayed such skin patterns only on their legs had been removed by him, not to speak of animals which had displayed such spots on other parts of their bodies.