For I want you to be [fully] aware, brothers, that our forefathers were all under the cloud, and all of them passed [safely] through the [Red] Sea. [Note: This refers to God guiding the Israelites through the desert during the daytime by a cloud moving along above them . See Ex. 13:21-22].

[So], do not worship idols as some of them did, as it is written [Ex. 32:6], "The people sat down to feast and drink, then got up and played." [Note: This refers to the Israelites engaging in an orgy of dancing and sex. See Ex. 32:17-19].

Look at the Israelites--the nation and their ritual. Are not those who eat the sacrifices joint-partakers in the altar?

It is written in the law [Isa. 28:11f], "I [i.e., God] will speak to these people [i.e., the Israelites] by men with foreign languages and through the lips of strangers, and even then they will not listen to me, says the Lord."