Exodus 32:6
5 When Aaron saw this, he built an altar before it, and Aaron made a proclamation and said, “Tomorrow will be a feast to the Lord.” 6 So they got up early on the next day and offered up burnt offerings and brought peace offerings, and the people sat down to eat and drink, and they rose up to play. 7 The Lord spoke to Moses, “Go quickly, descend, because your people, whom you brought up from the land of Egypt, have acted corruptly.
Onkelos 32:6
5 And Aharon saw, and builded an altar before it; and Aharon proclaimed and said, A feast shall be held before the Lord tomorrow. 6 And they arose next day, and sacrificed burnt offerings and offered oblations; and the people sat around to eat and drink, and rose up to disport. 7 And the Lord spake with Mosheh, Go, descend, for thy people whom thou broughtest up from the land of Mizraim have corrupted themselves;
Notes and References
"... According to Exodus 32:6 in the Hebrew: 'They rose early the next day, and offered burnt offerings and brought sacrifices of well-being; and the people sat down to eat and drink, and rose up to revel [literally 'and rose up to laugh'].' The LXX reads, 'and the people sat down to eat and drink and arose to dance.' Paul has followed the LXX, but his warning not to indulge in sexual immorality may reflect the Aramaic paraphrase: 'and the people sat down to eat and drink and rose up to play obscenely [getak] in foreign worship' (Targum Neofiti). In Aramaic, getak means either 'to laugh' or 'to jest,' as does tsahaq in Hebrew, but it also means "to be obscene," particularly with reference to idolatry ... In antiquity, pagan worship often involved temple prostitutes. It is this aspect that the Targum may reflect and that Paul also presupposes; hence his warning to avoid sexual immorality ..."
Evans, Craig A. Ancient Texts for New Testament Studies: A Guide to the Background Literature (pp. 212-213) Hendrickson Publishers, 2005