I Samuel 17:54 Midrash

וַיִּקַּ֤ח דָּוִד֙ אֶת־רֹ֣אשׁ הַפְּלִשְׁתִּ֔י וַיְבִאֵ֖הוּ יְרוּשָׁלִָ֑ם וְאֶת־כֵּלָ֖יו שָׂ֥ם בְּאָהֳלֽוֹ׃ (ס)

And David took the head of the philistine, and brought it to Jerusalem; but he put his armour in his tent.

Read midrashic interpretation of I Samuel 17:54: and classical rabbinic exegesis.