'Oil' in the Bible

At lunchtime, Boaz invited her, "Come on over, have some food, and dip your bread in our oil and vinegar." So she sat down beside the harvesters, and he handed her some roasted grain, which she ate until she was satisfied. She kept what was left over.

Wash, put on perfumed oil, and wear your best clothes. Go down to the threshing floor, but don’t let the man know you are there until he has finished eating and drinking.