'Sum' in the Bible

Then Josiah provided for the {lay people} sheep, lambs, and young goats, all for the Passover for all who were found [there], to the sum of thirty thousand, along with three thousand bulls. These [were] the possession of the king.

My mouth will tell of your righteousness, your salvation {all day long}, though I do not know [the full] sum [of them].

And to me, how precious are your thoughts, O God; how vast is their sum.