John Wesley on Proverbs 6:1

Surety - Rashly, without considering how thou shalt discharge the debt as occasion require. Otherwise suretyship in some cases may be not only lawful, but an act of justice and charity. Stricken thy hand - Obliged thyself by giving thine hand, as the custom then was in such cases. With - With the creditor, whom he calls a stranger, because the usurers in Israel, who lent money to others, upon condition of paying use for it, were either Heathens, or were reputed as bad as Heathens, because this practice was forbidden by God's law, Deut 23:19.