Deuteronomy 6:20–21:
When your son asks you in time to come, "What is the meaning of the testimonies and the statutes and the rules that the Lord our God has commanded you?" then you shall say to your son, "We were Pharaoh’s slaves in Egypt. And the Lord brought us out of Egypt with a mighty hand."
Charles Spurgeon:
Fathers and mothers are the most natural agents for God to use in the salvation of their children. I am sure that, in my early youth, no teaching ever had such an impression upon my mind as the instruction of my mother; neither can I conceive that, to any child, there can be one who will have such influence over the young heart as the mother who has so tenderly cared for her offspring.
We should especially tell our children our own experience… Perhaps, my friend, there is no testimony that you can bear which will be so useful, so interesting and so striking, as the testimony of what you have, yourself, seen and handled of the Word of Life.
Tell the gospel as you find it in the Bible, but set it in the frame of your own experience of its preciousness! Tell your son how you sinned and how the Lord had mercy upon you. Tell him how he met with you, how you were brought to seek his face, how you were born again, how you received a new heart and a right spirit. He will think the more of this great change because it happened to his father, or to his mother, or to some kind friend. And, perhaps, if he is not himself converted as a child, in his later life he may think of what you told him or the remembrance of his mother’s God may rise before him when he is far away from the scenes of his youth and has spent many years in foolish vanities — and he may even then turn to God, beckoned back to the great Father’s House above by the memory of his godly father and mother here below.
HT:
Tony Reinke
Deuteronomy 6:20–21: 
