Amos sees three visions in a row, and the first two follow almost the same pattern. First, locusts devouring the latter growth, the second crop that ordinary people depended on for survival. Then fire so consuming that 4"it devoured the great deep and was eating up the land." Both times, before the destruction finishes, Amos speaks: 2"O Lord GOD, please forgive! How can Jacob stand? He is so small!" And both times God relents. 3"It shall not be." 6"This also shall not be."
His appeal in both prayers rests on Israel's smallness and helplessness and makes no claim to merit. He never denies Israel's guilt or argues the judgment is undeserved. Between the first prayer and the second his word shifts, from "forgive" to the plainer 5"cease." He is appealing to God's pity for a people too small to survive what is coming. Twice that appeal works. God's relenting carries the weight of change, and these are prayers that change something.
Then comes a third vision, and everything about its shape is different. There are no locusts or fire, nothing self-explanatory enough to provoke an immediate cry for mercy. Instead God asks Amos a question. 8"Amos, what do you see?" 8"A plumb line," Amos answers, the simple tool a builder uses to test whether a wall stands straight. God makes the meaning explicit. 8"Behold, I am setting a plumb line in the midst of my people Israel." The wall built true to a standard long ago is now tested against it again and found crooked.
The line that follows marks the turn. 8"I will never again pass by them." No prayer of Amos interrupts this one. He does not even try. The earlier visions were disasters he could plead against. This one is a measurement, and a measurement is not something to plead against. It shows what is true. A plumb line does not argue with the wall.
Twice God's compassion made room for intercession to change what was coming. The third time the door does not open the same way, because persistent, unrepentant rejection of every warning already given had reached a point Scripture elsewhere calls past turning back. The same God who relented twice out of pity has run out of new warnings to send, because Israel had already spent every earlier one.
There is mercy in the shape of the passage even so. God shows Amos each vision before it happens and lets him pray, and the plumb line itself is a gift. A builder who sets a plumb line against a wall is still hoping to correct it, and a prophet who stands in the road with it is still sent in hope that someone will look.
Where has God set a line beside your life lately, and have you looked at it? If the wall has begun to lean, this is the time to tell him so.
Prayer
LORD, you relented twice over Jacob's smallness before you ever asked anything of Jacob's merit. Thank you for every prayer you have answered on the strength of your own pity and not our worthiness. Where you have set your plumb line against us and found the wall crooked, do not let us waste whatever warning we have left, as Israel wasted the warnings that came before. In Jesus' name, amen.