Final answer:
Abraham was stopped from sacrificing his son Isaac by an angel sent by God. This is depicted in the San Vitale mosaic, which illustrates the moment of divine intervention, symbolizing Abraham's faith and obedience.
Step-by-step explanation:
What stopped Abraham from sacrificing Isaac? According to the Hebrew Bible, specifically Genesis 22:1-19, Abraham was tested by God who asked him to sacrifice his son Isaac. As Abraham prepared to comply with God's command, he was stopped by an angel of the Lord. This dramatic intervention occurred at the very last moment, just as Abraham lifted his sword to slay his son Isaac, bound on the altar. The mosaic in the San Vitale, Ravenna, Italy, created in the early 6th century, depicts this pivotal moment. The figure 12.2.2 mosaic clearly shows an angel interrupting the sacrifice, effectively preventing the death of Isaac.
The story symbolizes the depth of faith that Abraham had in God, demonstrating his willingness to do anything that God commanded, even when it came to his own son. This narrative is foundational in not only Judaism but also Christianity and Islam, and echoes throughout various scriptures and religious teachings, highlighting moral themes regarding obedience, testing, and faith.