God had not only good cause to delay the giving of the Torah until after the departure of Jethro, but the time He chose to bestowing it was also chosen for a good reason. Just as a female proselyte, or a woman freed from captivity, or an emancipated slave, may not enter wedlock before she has for three months lived as a free Jewess, so God also waited three months after the deliverance of Israel from the bondage and the slavery of Egypt, before His union with Israel on Mount Sinai.
God furthermore treated His bride as did that king who went to the marriage ceremony only after he had overwhelmed his chosen bride with many gifts. So did Israel first receive manna, the well, and the quails, and not till then was the Torah granted them. Moses, who had received this promise when God had first appeared to him, viz., "When thou has brought forth the people out of Egypt, ye shall serve God upon this mountain"-waited most longingly for the promised time, saying, "When will this time come to pass?" When the time drew near, God said to Moses, "The time is at hand when I shall bring about something entirely new."