Ten

I'm not sure what is up with ten.

First, most human cultures use "base 10", counting groups of ten, tens of tens, etc. So, "ten fold" becomes a measure of estimation (a small group - 10, a big group - 100, etc.).

Then we have the Ten Commandments. Maybe it's a 7+3 thing (the ultimate, complete law of God). There are also ten horns on Daniel's fourth beast (horns are the symbol of power, particularly, worldly power; there are also ten horn references in the Revelation to John).