Commentary for Deuteronomy 16:12

וזכרת כי עבד היית וגו׳ AND THOU SHALT REMEMBER THAT THOU WAST A SERVANT [IN EGYPT] — Only on this condition did I deliver you from Egypt: that you keep and do these statutes.

AND THOU SHALT REMEMBER THAT THOU WAST A BONDMAN IN EGYPT. Rabbi Abraham [ibn Ezra] said that this phrase is connected with the expression and thy manservant, and thy maidservant³⁶³Verse 11. [mentioned in the first part of the preceding verse]. The correct interpretation is according to the plain meaning thereof, that you are to observe these statutes³⁶⁴In Verse 12 before us. which the Lord Who redeemed thee out of the house of bondage³⁶⁵Above, 13:6. commanded you. We also proclaim in the Kiddush of that [festival] day, “It is a memorial of the exodus from Egypt.” He stated these statutes³⁶⁴In Verse 12 before us. with reference to the Festival of Weeks [an expression not used with reference to the other festivals] because the reason for the counting of seven weeks, and the observing of only the fiftieth day as the only solemn assembly is not mentioned in the Torah [and hence they are accounted as chukim — “statutes,” commandments for which we do not know the reasons, and therefore he warned us to observe and do these statutes]. I have already mentioned their secret.³⁶⁶Leviticus 23:36.
Shoftim

וזכרת כי עבד היית, where you did not own any money of your own, seeing that whatever is in the hands of a slave is owned by his master. (Pessachim 88)