In his lament, David said, "Tell it not in…" which Philistine city?

Answer: Gath

"Tell it not in Gath; proclaim it not in the streets of Ashkelon, lest the daughters of the Philistines rejoice."

“Tell it not in Gath; proclaim it not in the streets of Ashkelon, lest the daughters of the Philistines rejoice, and the daughters of the uncircumcised exult.”— 2 Samuel 1:20 (BSB)