There is also the matter of priests being baptized before assuming priestly duties...
Which was part of the instruction (laws) given unto Moses.
yes John was of the leviticle line of preists he was the last prophet of the Old Testament promised To precede the messiah and prepare the people for him through the knowledge of remission of sins
“For I say unto you,
Among those that are born of women there is not a greater prophet than John the Baptist:
but
he that is least in the kingdom of God is greater than he.”
Luke 7:28 KJV
John was beheaded before he could be born again.
“
The law and the prophets were until John:
since that time the kingdom of God is preached, and every man presseth into it.”
Luke 16:16 KJV
“Behold,
I will send my messenger, and he shall prepare the way before me:
and the Lord, whom ye seek, shall suddenly come to his temple, even the messenger of the covenant, whom ye delight in: behold, he shall come, saith the LORD of hosts.”
Malachi 3:1 KJV
“As
it is written in the prophets, Behold, I send my messenger before thy face, Which shall prepare thy way before thee.
…
John did baptize in the wilderness, and preach the baptism of repentance for the remission of sins.
And there went out unto him
all the land of Judæa, and they of Jerusalem, and were all baptized of him in the river of Jordan, confessing their sins. ( Jesus hasn’t yet been revealed or began to preach the gospel but his predecessor has arrived )
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;”
Mark 1:2, 4-6
Jesus says John is the promised prophet at the end of the Old Testament Elijah who was to come
“Behold, I will send you Elijah the prophet before the coming of the great and dreadful day of the LORD: and he shall turn the heart of the fathers to the children, and the heart of the children to their fathers, lest I come and smite the earth with a curse.”
Malachi 4:5-6 KJV
thats the last two verses of the ot prophets Jesus was explaining about john to his disciples that believed him
“For
all the prophets and the law prophesied until John.
And
if ye will receive it, this is Elijah, which was for to come.
He that hath ears to hear, let him hear.”
Matthew 11:13-15 KJV
john is a unique figure in prophecy he is the last prophet of the Old Testament order calling Israel to repentance warning then for the final time
“as it is written in the book of the words of Esaias the prophet, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, Make his paths straight. Then said he to the multitude that came forth to be baptized of him, O generation of vipers, who hath warned you to flee from the wrath to come? Bring forth therefore fruits worthy of repentance, and begin not to say within yourselves, We have Abraham to our father: for I say unto you, That God is able of these stones to raise up children unto Abraham. And now also the axe is laid unto the root of the trees: every tree therefore which bringeth not forth good fruit is hewn down, and cast into the fire.”
Luke 3:4, 7-9 KJV
Also he was carrying the message of Jesus and the kingdom of heaven being near to come forth with Jesus the messiah
“In those days came
John the Baptist, preaching in the wilderness of Judæa, and saying, Repent ye: for the kingdom of heaven is at hand. For
this is he that was spoken of by the prophet Isaiah , saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, Make his paths straight.”
Matthew 3:1-3 KJV
John is actually a figure who was foretold himself so I’m sure there’s alot to him given the things Jesus said of him several really and what to prophecies like this one say
“Comfort ye, comfort ye my people, saith your God.
The voice of him that crieth in the wilderness, Prepare ye the way of the LORD, make straight in the desert a highway for our God. Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain: and
the glory of the LORD shall be revealed, and all flesh shall see it together: for the mouth of the LORD hath spoken it.
….
Behold, the Lord GOD will come with strong hand, and his arm shall rule for him: behold, his reward is with him, and his work before him. He shall feed his flock like a shepherd: he shall gather the lambs with his arm, and carry them in his bosom, and shall gently lead those that are with young.”
Isaiah 40:1, 3-5, 10-11 KJV
The prophecies of johns birth in luke also agree with what jesus is saying of john of the leviticle line as you say there to that point
Where one testement is being fulfilled another is being given and the audience is being expanded to all people who hear and believe the gospel of our lord
Im sorry to run on sister john is really a orettt prominent figure regarding israel and leviticle heritage is part of it as your saying there