SOURCE: Stutchkoff, Der Oytser fun der Yidisher Shprakh.
וואָס אַ ווענטקע פֿאַר פֿיש איז חניפֿה פֿאַר מלכים.
Vos a ventke far fish iz khnife far mlokhim.
What a fishing rod is to fish, flattery is to kings.