According to edit link removed this, it’s from a German folk song.
Why don’t you tell us the name of the german song, and then we can google it and listen to it.
Because I don’t know it (but I’ll try to look it up).
Found it.
The present melody for the ?anukkah hymn has been identified by Birnbaum as an adaptation from the old German folk-song “So weiss ich eins, dass mich erfreut, das pluemlein auff preiter heyde,”