"Benjamin the child of mine old age held hostage into Egypt"

This reference relates to Genesis 41-46. During the seven year famine which devastates the Middle East, Benjamin’s father Jacob orders his ten sons (Benjamin’s half-brothers) to go from Israel into Egypt to secure grain. When they arrive, they are accused of being spies by the Vizier. Unbeknownst to them, the Vizier is in fact Benjamin’s direct brother, Joseph, whom they had previously sold into slavery. He demands that the ten sons bring their young sibling with them into Egypt to prove their integrity. Jacob, fearing to lose his favourite son, is reluctant to comply but eventually does so. The idea of Benjy as a sacrifice ties in with later imagery that allies him with Christ.