Rashi: When I washed my feet in butter. Chemah is like Chem'ah. Ibn Ezra - sometimes Aleph is omitted, e.g. Beis She'an is written "Beis Shan" (Shmuel I, 31:10). This is a Mashal.

Malbim: When my property succeeded, I washed my roads with butter, until it was smooth to walk on.

Rashi: I had all contentment and desires of my heart, which are pleasant like rivers of oil ¹ . Yatzuk is pouring, like "v'Yatzakta."

Malbim: Even things not prepared for profit and wealth, like a rock is not proper to give liquid, were reversed for me to success, rivers of oil and great wealth.