Mark 1:6
And John was clothed with camel’s hair, and with a girdle of a skin about his loins; and he did eat locusts and wild honey;
Cross-references
2 Kings 1:8
Typology
2 Kings 1:8 describes Elijah's garment of hair and leather belt, which John the Baptist deliberately echoes in Mark 1:6, identifying him as Elijah's successor.
Matthew 3:4
Parallel
Matthew 3:4 gives the identical description of John's clothing and diet, confirming the synoptic tradition.
Leviticus 11:22
Historical context
Leviticus 11:22 lists locusts as clean food, showing John's diet was lawful under the Law.
Luke 7:33
Parallel
Luke 7:33 describes John's ascetic lifestyle (no bread/wine) that led to accusations, echoing his locust-and-honey diet.