1)
What was the Efod?
1.
Radak: It was like a belt, or a gold garment.
2)
Why did he make an Efod?
1.
Rashi: It was a commemoration of the great salvation, to show how great was Midyan's army, that the rings of the esteemed ones comprised so much gold.
3)
When did Yisrael stray after the Efod?
1.
Rashi: It was after Gid'on died. Radak - they made it a god (Yerushalmi Avodah Zarah 3:6). Malbim - he was punished for this; his sons were killed
