הַעֲנֵ֤יק תַּעֲנִיק֙ ל֔וֹ מִצֹּ֣אנְךָ֔ וּמִֽגָּרְנְךָ֖ וּמִיִּקְבֶ֑ךָ אֲשֶׁ֧ר בֵּרַכְךָ֛ יְהוָ֥ה אֱלֹהֶ֖יךָ תִּתֶּן־לֽוֹ׃
thou shalt furnish him liberally out of thy flock, and out of thy threshing-floor, and out of thy winepress; of that wherewith the LORD thy God hath blessed thee thou shalt give unto him.
Sefer HaChinukh
To endow him upon his leaving to freedom: To give from what we have to the Hebrew slave at the time that he leaves from under our hand to freedom, and we should not send him empty-handed. And about this is it stated (Deuteronomy 15:14), "You shall surely endow him; from your flock and from your threshing floor and from your vat that the Lord, your God, has blessed you, shall you give to him."