In a context of strict Jewish monotheism, the following four activities were considered blasphemous for anyone other than God.

• Jesus expressed his authority to forgive sins, even sins not committed against him personally – a prerogative reserved for God alone (Mark 2:5-7).
• Jesus accepted worship from other human beings – a prerogative reserved for God alone (Matthew 28:16-17).
• Jesus exercised the power and authority to raise the dead – a prerogative for God alone (John 5:21).
• Jesus claimed to possess the authority to judge humanity – a prerogative reserved for God alone (John 5:22, 27).

Jesus equated Himself with God.

• To know Jesus is to know God (John 14:7).
• To see Jesus is to see God (John 14:9).
• To trust in Jesus is to trust in God (John 14:1).
• To honor Jesus is to honor God (John 5:23).
• To welcome Jesus is to welcome God (Mark 9:37).
• To encounter Jesus is to encounter God (John 14:11).

For a more explanatory treatment read Kenneth Samples’ book 7 Truths That Changed The World.