Holier Than Thou - Biblical Contradictions

Who dug the well called Beersheba -- Abraham or Isaac?

Genesis 21:27, 30-31, "So Abraham brought sheep and cattle and gave them to Abimelech, and the two men made a treaty... He replied, 'Accept these seven lambs from my hand as a witness that I dug this well.' So that place was called Beersheba [well of the oath], because the two men swore an oath there."

Genesis 26:32-33, "That day Isaac's servants came and told him about the well they had dug. They said, 'We've found water!' He called it Shibah [oath], and to this day the name of the town has been Beersheba."

According to Genesis chapter 21, Abraham was responsible for the well named Beersheba, however, Genesis chapter 26 attributes it to Isaac.

"Sorrow is better than laughter: for by the sadness of the countenance the heart is made better. The heart of the wise is in the house of mourning; but the heart of fools is in the house of mirth." (Ecclesiastes 7:3-4, KJV)

"Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be merry: for that shall abide with him of his labour the days of his life, which God giveth him under the sun." (Ecclesiastes 8:15, KJV)