'Observers' in the Bible

Then observers will say, "Yes indeed, the godly are rewarded! Yes indeed, there is a God who judges in the earth!"

"'This is what the sovereign Lord says: On the day it went down to Sheol I caused observers to lament. I covered it with the deep and held back its rivers; its plentiful water was restrained. I clothed Lebanon in black for it, and all the trees of the field wilted because of it.

When they heard this, they praised God. Then they said to him, "You see, brother, how many thousands of Jews there are who have believed, and they are all ardent observers of the law.