Deliver Your people, bless Your heritage; shepherd them and raise them forever. (28:9)
In Hebrew, this verse has exactly 10 words. Because of an odd Jewish bias against counting people, this verse is often used on traditional settings to count people to determine whether a minyan is present. The bias comes from to main places in the Bible:
Exodus 30, where a half shekel ransom is taken along with a national census, possible to “atone” for taking the census.
Samuel 24, where King David took a census and as a result 70,000 people died of a plague.
Counting people or possessions was seen as dangerous, lest it attract the evil eye and cause death. In addition, there is something distasteful about assigning people numbers. Number are dehumanizing (e.g. Holocaust tattoos), and because they are associated with value, numbers may imply that some people have higher value than others. Therefore, Exodus 30 takes a coin from each person and counts the coins, rather than counting the people directly.
So, back to our verse, rather than counting a minyan by number people in the room, you might assign each person a word from the verse:
Hoshia et amekha, u-varekh et nahalatekha; ur’em v’nas’em ad olam.
Of all the verses that have exactly 10 words (I haven’t counted them, but I imagine there must be a good number), this is the one that has become popular. Perhaps because the verse is a plea for deliverance, and if we are going to do something as dangerous and dehumanizing as count human beings (even indirectly), we ought to do it with a prayer for their safety and deliverance, calling upon the shepherd God who takes care of the flock. You hear a popular melody of this verse here.