וְעַתָּ֖ה עֲשׂ֑וּ כִּ֣י יְהוָ֗ה אָמַ֤ר אֶל־דָּוִד֙ לֵאמֹ֔ר בְּיַ֣ד ׀ דָּוִ֣ד עַבְדִּ֗י הוֹשִׁ֜יעַ אֶת־עַמִּ֤י יִשְׂרָאֵל֙ מִיַּ֣ד פְּלִשְׁתִּ֔ים וּמִיַּ֖ד כָּל־אֹיְבֵיהֶֽם׃
now then do it; for the LORD hath spoken of David, saying: By the hand of My servant David I will save My people Israel out of the hand of the Philistines, and out of the hand of all their enemies.’
Read Kabbalistic (mystical) interpretations of II Samuel 3:18: Zohar and classical Jewish mystical sources, free online.