I might think, (that they were steeped in blood) even after they received it; it is, therefore, written "only" (a term of limitation). Once they received it, they observed it with joy. [Rabban Gamliel says: It states "Only strengthen yourself not to eat the blood". If Scripture exhorted us so concerning the "lightest" mitzvah of the Torah, (not to eat) blood, how much more so are we thus exhorted concerning the other mitzvoth of the Torah!]
R. Shimon b. Gamliel says: Every mitzvah that Israel accepted with joy at Mount Sinai they still observe with joy, and every mitzvah that they did not accept with joy they do not observe with joy. R. Shimon b. Eliezer says: Every mitzvah for which Israel gave their lives at a time of shmad (enforced conversion) they adhere to strongly, and every mitzvah for which they did not give their lives at a time of shmad is still "weak" in their hands. [R. Shimon Berebbi says: We can say of all the mitzvoth of the Torah: If Scripture exhorted us so concerning the "lightest" mitzvah of the Torah, (not to eat) blood, how much more so are we thus exhorted concerning the other mitzvoth of the Torah!]