וַֽיְהִי֙ אַֽחֲרֵי־כֵ֔ן וַתְּהִי־ע֧וֹד הַמִּלְחָמָ֛ה בְּג֖וֹב עִם־פְּלִשְׁתִּ֑ים אָ֣ז הִכָּ֗ה סִבְּכַי֙ הַחֻ֣שָׁתִ֔י אֶת־סַ֕ף אֲשֶׁ֖ר בִּילִדֵ֥י הָרָפָֽה׃ (פ)
And it came to pass after this, that there was again war with the Philistines at Gob; then Sibbecai the Hushathite slew Saph, who was of the sons of the giant.
Read kabbalistic (mystical) interpretation of II Samuel 21:18: and classical mystical sources.