Son of Abraham and Sarah, miraculously born when Sarah was well past child-bearing age. His name means 'he laughs.' He was nearly sacrificed by his father as a test of faith but God provided a ram as a substitute. He married Rebekah and fathered the twins Jacob and Esau. He renewed the covenant God made with Abraham.
And Abraham called the name of his son that was born unto him, whom Sarah bare to him, Isaac.Genesis 21:3, KJV
Genesis 22:9
And they came to the place which God had told him of; and Abraham built an altar there, and laid the wood in order, and bound Isaac his son, and laid him on the altar upon the wood.Genesis 22:9, KJV
Genesis 26:1
And there was a famine in the land, beside the first famine that was in the days of Abraham. And Isaac went unto Abimelech king of the Philistines unto Gerar.Genesis 26:1, KJV
Genesis 35:27
And Jacob came unto Isaac his father unto Mamre, unto the city of Arbah, which is Hebron, where Abraham and Isaac sojourned.Genesis 35:27, KJV
Hebrews 11:17
By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son,Hebrews 11:17, KJV
See how Isaac connects to every other figure in Scripture.