In the Hanerot Halalu that we recite when lighting the Hanukkah candles, it says "anachnu madlikin." Why madlikin and not madlikim? Why is a final nun used and not a final mem? I have searched EVERYWHERE!
The source for this recitation is Tractate Soferim (20:4). Aramaic was a major lingustic influence on halachic literature in Babylonia during the Geonic period when that tractate was composed, and in Aramaic the plural form ends with a nun rather than a mem.