Proverbs 25:13 Kabbalah

כְּצִנַּת־שֶׁ֨לֶג ׀ בְּי֬וֹם קָצִ֗יר צִ֣יר נֶ֭אֱמָן לְשֹׁלְחָ֑יו וְנֶ֖פֶשׁ אֲדֹנָ֣יו יָשִֽׁיב׃ (פ)

As the cold of snow in the time of harvest, So is a faithful messenger to him that sendeth him; For he refresheth the soul of his master. .

Read kabbalistic (mystical) interpretation of Proverbs 25:13: and classical mystical sources.