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—
Rashi on Proverbs
My son, if you have stood surety Our Sages explained this as referring to surety in monetary matters, according to its apparent meaning.