Midrash su Deuteronomio 16:8

The Master said above: "They leave eternal life for temporary affairs." Is not enjoying the festival a meritorious duty? This is according to the opinion of R. Eliezer himself, who says that enjoyment on a festival is only optional, for we are taught in a Baraitha: R. Eliezer says: "A man has nothing to do on a festival but either to eat and drink the whole day, or to sit and study;" but R. Joshua says: "He must divide the day one-half for religious purposes, and one-half for eating and drinking." R. Jochanan said: "Both the above sages formed their opinions from the same Biblical passage: One passage says (Deut. 17, 8) On the seventh day shall be a solemn assembly unto the Lord thy God. Another passage says (Num. 29, 35) An assembly shall be unto you. How can both unto God and unto you be explained? R. Eliezer explains it thus: "The whole day shall be either for you or for the Lord"; but R. Joshua explains it thus: "Divide the day, one-half for the Lord and one-half for you." Who is meant in the above passage, Send portions unto him for whom nothing is prepared? R. Chisda said: It refers to those men who have not provided Erub Tabshilin. Others say: This refers only to one who did not have the food with which to provide Erub Tabshilin, but not for one who, through neglect, did not provide Eruh Tabshilin. What is meant by Let the joy of the Lord be your stronghold? R. Jochanan said in the name of R. Elazar b. Simon: "The Holy One, praised be He! said to Israel: 'My children, borrow on my account and celebrate the sanctity of the day, and trust to me, I shall pay it.' "

3) "the festival of matzoth to the L–rd, seven days, etc." What is the intent of this? Because it is written (Devarim 16:8) "Six days shall you eat matzoth and on the seventh day it is a cessation (atzereth) for the L–rd" — The seventh day was included in the general (mitzvah of matzoh, viz.: [Shemoth 13:6] "Seven days shall you eat matzoth; and it left that general category to serve as a paradigm, viz.: Just as (the eating of matzoth on) the seventh day is permitted (and not obligatory), so, all (of the days) are permitted (in this regard, and not obligatory.) I might think that (the eating of matzoth on) the first night, too, is permitted (and not obligatory); it is, therefore, written (Devarim 16:3) "Upon it shall you eat matzoth" — Scripture makes it mandatory.

5) R. Shimon b. Elazar says: In one place (Devarim 16:8) it is written "Six days shall you eat matzoth," and, in another, (Shemoth 12:15) "Seven days shall you eat matzoth"! How is this to be resolved? Matzoh which cannot eat seven days from the new grain, (permission to eat of the new grain [chadash] beginning with the bringing of the omer on the second day of the festival), you can eat, seven from the old grain and six from the new. How, then, must I understand "from the morrow of the Sabbath? As from the morrow of the festival.