Deuteronomy 29:25

לא ידעום [FOR THEY … SERVED OTHER GODS] WHOM THEY KNEW NOT — i.e. in whom they had never experienced any Divine power. ולא חלק להם means, He did not give them (the gods) to be their portion (cf. Rashi on Deuteronomy 4:19). Onkelos, however, renders it by לא אוטיבא להון, i.e. they did not bestow upon them any good. As for the expression לא חלק, Onkelos took it thus, explaining also the singular form of the verb: that god which they have chosen for themselves has never given them any חלק, any inheritance or portion.

וַיֵּלְכ֗וּ וַיַּֽעַבְדוּ֙ אֱלֹהִ֣ים אֲחֵרִ֔ים וַיִּֽשְׁתַּחֲו֖וּ לָהֶ֑ם אֱלֹהִים֙ אֲשֶׁ֣ר לֹֽא־יְדָע֔וּם וְלֹ֥א חָלַ֖ק לָהֶֽם׃

for they went and served other gods, and worshipped them, gods whom they knew not, and whom he had not given to them: