'Only Son' in the Bible

And he said, Take now thy son, thine only son, whom thou love, even Isaac, and get thee into the land of Moriah. And offer him there for a burnt offering upon one of the mountains which I will tell thee of.

And he said, Do not lay thy hand upon the lad, neither do thou anything to him. For now I know that thou fear God, since thou have not withheld thy son, thine only son, from me.

and said, By myself I have sworn, says LORD, because thou have done this thing, and have not withheld thy son, thine only son,

O daughter of my people, gird thee with sackcloth, and wallow thyself in ashes. Make thee mourning, as for an only son, a most bitter lamentation. For the destroyer shall suddenly come upon us.

And I will turn your feasts into mourning, and all your songs into lamentation. And I will bring sackcloth upon all loins, and baldness upon every head, and I will make it as the mourning for an only son, and the end thereof as a b