Genesis 25:9

His sons Isaac and Ishmael buried him - Though Ishmael and his mother had been expelled from Abraham's family on the account of Isaac, yet, as he was under the same obligation to a most loving affectionate father as his brother Isaac, if any personal feuds remained, they agreed to bury them on this occasion, that both might dutifully join in doing the last offices to a parent who was an honor to them and to human nature: and, considering the rejection of Ishmael from the inheritance, this transaction shows his character in an amiable point of view; for though he was a wild man, (see Genesis 16:12), yet this appellation appears to be more characteristic of his habits of life than of his disposition.

For the character of Abraham see the conclusion of this chapter, Genesis 25:34 (note).

Isaac and Ishmael, - in brotherly cooperation. Ishmael was the oldest son, dwelt in the presence of all his brethren, and had a special blessing. The sons of Keturah were far away in the East, very young, and had no particular blessing. Ishmael is therefore properly associated with Isaac in paying the last offices to their deceased father. The burying-place had been prepared before. Its purchase is here rehearsed with great precision as a testimony of the fact. This burial-ground is an earnest of the promised possession.

25:9 Here is nothing recorded of the pomp or ceremony of his funeral; only we are told, his sons Isaac and Ishmael buried him - It was the last office of respect they had to pay to their good father. Some distance there had formerly been between Isaac and Ishmael, but it seems either Abraham had himself brought them together while he lived, or at least his death reconciled them. They buried him, in his own burying - place which he had purchased and in which he had buried Sarah. Those that in life have been very dear to each other, may not only innocently, but laudably, desire to be buried together, that, in their deaths, they may not be divided, and in token of their hopes of rising together.