An "allegory" is a story in which the people and things in it represent other things. In Paul's allegory, the two women referred to in [Galatians 4:22](./22.md) represent two covenants.
"Mount Sinai" here is a synecdoche for the law that Moses gave to the Israelites there. Alternate translation: "Mount Sinai, where Moses gave the law to Israel" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
Paul treats the law as if it were a person. Alternate translation: "The people under this covenant are like slaves who have to obey the law" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-personification]])