“On that very day Abraham took his son, Ishmael, and every male in his household, including those born there and those he had bought. Then he circumcised them, cutting off their foreskins, just as God had told him” (Genesis 17:23 NLT).

When my children were young and took too long to obey, I would say to them, “Slow obedience is no obedience.” Certainly, Abraham could not be accused of this. He was quick to obey God, as the Scripture says, “On that very day…” When Abraham believed, he obeyed. There was no disconnect between his faith and his obedience. Not only was he quick to obey, he obeyed fully. As the Scripture also says, “Just as God had told him.”
 
It is good to teach our children to obey us just as Abraham obeyed the Lord. Three attributes of obedience should be taught. In teaching, you might ask, “Johnny, how do you obey?” And his learned response should be, “Immediately, sweetly and completely.” This is good training for our children, but also good instruction for how we should obey the Lord.