Cyrill of Alexandria
The significance of consuming unleavened bread and abstaining from work on the Sabbath, as well as the sanctification of the first and seventh days, has been distinctly articulated in the earlier discussion (Ex. 12:15-16).
And on the fifteenth day the solemn feast: seven days shall they eat unleavened bread.
וּבַחֲמִשָּׁ֨ה עָשָׂ֥ר י֛וֹם לַחֹ֥דֶשׁ הַזֶּ֖ה חָ֑ג שִׁבְעַ֣ת יָמִ֔ים מַצּ֖וֹת יֵאָכֵֽל׃
One Church Father comments on this verse
The significance of consuming unleavened bread and abstaining from work on the Sabbath, as well as the sanctification of the first and seventh days, has been distinctly articulated in the earlier discussion (Ex. 12:15-16).
Passages read together with this verse.