Genesis 25:8

Then Abraham gave up the ghost, and died-in a good old age, an old man and full of years, and was gathered to his people. Though Abraham did not live as long as his forefathers before him, yet he had had his fill of this world, both in length of life and in its misery and tribulation. His strength failed, he died, he was added to his people; his soul was received into heaven, to join the number of those that had died in the faith of the Messiah. Note that the Bible here plainly teaches the continued existence of the soul after death and implies a state of bliss.