1)
What is "Ezor"?
1.
Rashi: It is a belt.
2)
Why may he not put it in water?
1.
Rashi: Do not launder it when it is sweaty, so it will decay quickly. 1
2.
Malbim: If a linen garment is not laundered constantly, it becomes black.
1
Radak: If so, Hashem should have said 'do not launder it'! I do not know why He commanded not to put it in water. Malbim - this is the beginning of laundering.
