'Uncircumcised' in the Bible

Jonathan said to the young man who bore his armor, "Come, and let us go over to the garrison of these uncircumcised. It may be that Yahweh will work for us; for there is no restraint on Yahweh to save by many or by few."

David spoke to the men who stood by him, saying, "What shall be done to the man who kills this Philistine, and takes away the reproach from Israel? For who is this uncircumcised Philistine, that he should defy the armies of the living God?"

Your servant struck both the lion and the bear. This uncircumcised Philistine shall be as one of them, since he has defied the armies of the living God."

Then Saul said to his armor bearer, "Draw your sword, and thrust me through with it, lest these uncircumcised come and thrust me through, and abuse me!" But his armor bearer would not; for he was terrified. Therefore Saul took his sword, and fell on it.