I Corinthians 10 Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
2 And were all baptized unto Moses in the cloud and in the sea;
3 And did all eat the same spiritual meat;
4 And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
5 But with many of them God was not well pleased: for they were overthrown in the wilderness.
6 Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
7 Neither be ye idolaters, as were some of them; as it is written, The people sat down to eat and drink, and rose up to play.
8 Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
9 Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents.
10 Neither murmur ye, as some of them also murmured, and were destroyed of the destroyer.
11 Now all these things happened unto them for examples: and they are written for our admonition, upon whom the ends of the world are come.
12 Wherefore let him that thinketh he standeth take heed lest he fall.
21 Ye cannot drink the cup of the Lord, and the cup of devils: ye cannot be partakers of the Lord’s table, and of the table of devils.
22 Do we provoke the Lord to jealousy? are we stronger than he?
23 All things are lawful for me, but all things are not expedient: all things are lawful for me, but all things edify not.
Grace is provided to us to restore our relationship with God; because we who are of a perverse heart cannot ever be perfect righteousness. Still, that Grace should never be mocked by our searching after human lusts and say that after all Grace has covered it. The Israelites were lead out of Egypt with many miracles displayed by God. They were saved by faith looking forward toward Christ who is the Messiah to come. All of the old testament from Genesis to Malachi are a portrait painting forward to Christ. Throughout the old testament is shown salvation by Grace through Faith. There are many examples left to demonstrate to us that fact. Abraham, Moses, Daniel, David and all the old testament saints were shown to be saved by faith and not by the law. So the Israelites were in the wilderness (much like we on this earth) waiting to enter in the "promised land". Instead of looking forward to the promise and holding tight to faith, they chose to murmur, to become drunk, sexual immorality, lust, and idol worship. We are saved and sealed by Grace; yet, it is not expedient for me to take that lightly. Nor can I be peaceful or happy if I spend my life in murmuring, lust, and sin. How can I say that I love and seek after God–if I do not renounce sin in my own heart and life? Yet, when we seek Him with all our hearts and like David present to Him our broken and contrite heart (destroyed by some sin we allowed in our lives); He so gently restores us into that fellowship of peace and joy with Him.
http://www.youtube.com/watch?v=-LbHd6eZrgk&list=UU42mNOLo78vBCpPh34HSUTw&index=3&feature=plcp