וַיִּדְבַּק֙ בַּֽיהוָ֔ה לֹא־סָ֖ר מֵאַֽחֲרָ֑יו וַיִּשְׁמֹר֙ מִצְוֺתָ֔יו אֲשֶׁר־צִוָּ֥ה יְהוָ֖ה אֶת־מֹשֶֽׁה׃
For he cleaved to the LORD, he departed not from following Him, but kept His commandments, which the LORD commanded Moses.
Read kabbalistic (mystical) interpretation of II Kings 18:6: and classical mystical sources.