Kommentar zu Schemot 23:17

שלש פעמים וגו׳ THREE TIMES etc. — Because this section speaks mainly of the Sabbatical year, it was necessary to state that the sequence of the festivals should not be disturbed even in this year of agricultural rest (Mekhilta d'Rabbi Yishmael 23:16; cf. Rashi on v. 12).

שלש פעמים בשנה יראה, to give thanks to the Lord for the attainment of freedom from bondage, in spring, in summer and in fall. All our achievements stem from Him.

'האדון ה, seeing that the whole earth is His, no one will covet your land when you come to Jerusalem to perform the commandment of making these pilgrimages. We have been promised this in Exodus 34,23, when the Torah speaks about expanding our territory, requiring that all the males come up to Jerusalem on three occasions. The names which the Torah attributes to G’d usually fit the subject matter under discussion, seeing that G’d has as many names as He has attributes. Wherever the attribute אדון is used it is connected with tenancy of the land of which G’d is the ultimate owner. We find the term אדון used for G’d also by Isaiah 10,33