ISB ~ Mark 3 v22

Beelzebul:A pagan god worshipped at Ekron (see Baalzebub, 2 Kings 1:2-16). The name probably meant “Prince Baal”. The scribes use it as a disdainful title for Satan.

by the prince of demons:It was commonly held that weaker demons could be exorcised by more powerful ones. The scribes wrongfully attribute Jesus’ power to the sorcery of Satan, the most powerful demon of all (Mt 9:34; 10:25; CCC 548).