Matthew 3:4 describes John's camel hair garment and locust diet, detailing the ascetic lifestyle that led to the accusation in 11:18.

In Matthew 10:25, Jesus warns disciples will be called Beelzebul like him — connecting John's demon accusation to a pattern of slander against God's messengers.

In Matthew 9:14, John's disciples ask about fasting, confirming John's ascetic lifestyle mentioned here.

In Matthew 21:32, John is rejected despite showing the way of righteousness, explaining why people slander him here.

In Luke 1:15, John's birth prophecy states he will never drink wine — directly explaining the 'neither drinking' in Matthew 11:18.

In John 7:20, the crowd tells Jesus 'You have a demon!' — the same accusation John received, linking their experiences.

In John 8:48, Jesus is accused of having a demon — directly paralleling John's slander in Matthew 11:18.

In John 10:20, many say Jesus 'has a demon and is insane' — echoing the accusation against John.