In the first couple of chapters of Amos, we see a number of proclamations from God that all begin with (all ESV)
"For three transgressions of [region/group], and for four, I will not revoke the punishment".
In Proverbs 30 this pattern also occurs four times, such as in verse 15b
Three things are never satisfied; four never say, “Enough”:
This pattern is repeated in verses 18, 21, and 29. Though in verse 24 the pattern is not followed, and we simply read
Four things on earth are small, but they are exceedingly wise:
Also, we see the pattern in Job 5:19:
He will deliver you from six troubles; in seven no evil shall touch you.
and in Proverbs 6:16:
There are six things that the Lord hates, seven that are an abomination to him:
Also, Psalm 62:11:
Once God has spoken; twice have I heard this:
What is the purpose of this N .. N+1 construct? Why is it used some places and not others?