בְּ֭נִי אִם־עָרַ֣בְתָּ לְרֵעֶ֑ךָ תָּקַ֖עְתָּ לַזָּ֣ר כַּפֶּֽיךָ׃
My son, if thou art become surety for thy neighbour, If thou hast struck thy hands for a stranger—
Read kabbalistic (mystical) interpretation of Proverbs 6:1: and classical mystical sources.