John Gill Commentary Genesis 44:32

"For thy servant became surety for the lad unto my father, saying, If I bring him not unto thee, then shall I bear the blame to my father for ever." — Genesis 44:32 (ASV)

For your servant became surety for the lad unto my father
Which is another argument used for the release of Benjamin, though he should be detained for him, which he offers to be: saying, if I bring him not unto you, then I shall bear the blame unto
my father for ever; (See Gill on Genesis 43:9).