One of Avraham's (Abraham) tests, in which G-d him to sacrifice his son Yitzchak (Isaac). Avraham brought his son to the location that G-d commanded and bound him on the altar, at which point G-d commanded him to stand down. Described in Bereishis Ch. 22. Also known as "Akeidat Yitzchak," or simply "the Akeidah."
According to the biblical story, God commands Abraham to offer his son Isaac as a sacrifice. (Genesis 22:5 and 22:8). After Isaac is bound to an altar, the angel of God stops Abraham at the last minute, saying "now I know you fear God." At this point Abraham sees a ram caught in some nearby bushes and sacrifices the ram instead of Isaac.
The Book of Genesis does not tell the age of Isaac at the time. While it is often presented that Isaac was a small child, verse 6 of Chapter 22 indicates that Isaac was at least grown enough to walk alongside Abraham up the mountain carrying the load of wood that his father had gathered (22:6). The Talmudic sages teach that Isaac was thirty-seven [...]