Yahweh said to me, "Amos, what do you see?" I said, "A plumb line." Then the Lord said, "Behold, I will set a plumb line in the midst of my people Israel. I will not again pass by them any more.
"I will not again pass by them any more ..." Again, the clear reference to the ancient Passover is evident; only, this time, he will not do a similar thing.  As Smith said: