Attributing the miracles done by Christ -- accompanied by the power of the Holy Spirit working in and through Him -- to the devil (also called Beelzebub) was the blasphemy of the Holy Spirit.
We need to keep in mind that the Father, the Son, and the Holy Spirit were all involved in the miracles of Christ. Hence He said that He performed them "with the finger of God". But here they were accusing Christ of being demon-possessed, and that was a direct insult to the Holy Spirit. This sin would not ever be forgiven since it was deliberate and malicious and wicked.
“We need to keep in mind that the Father, the Son, and the Holy Spirit were all involved in the miracles of Christ.”
“For
in him dwelleth
all the fulness of the Godhead bodily.”
Colossians 2:9 KJV
“And
Jesus came and spake unto them, saying,
All power is given unto me in heaven and in earth.
Go ye therefore, and teach all nations,
baptizing them in the name of
the Father, and of
the Son, and of
the Holy Ghost:
teaching them to observe all things whatsoever I have commanded you:
and, lo,
I am with you alway, even unto the end of the world. Amen.”
Matthew 28:18-20 KJV
“When they heard this, they were
baptized in the name of the Lord Jesus.”
Acts 19:5 KJV
“And
he commanded them to be baptized in the name of the Lord. Then prayed they him to tarry certain days.”
Acts 10:48 KJV
“And now why tarriest thou?
arise, and be baptized, and wash away thy sins, calling on the name of the Lord.”
Acts 22:16 KJV
“But
when they believed Philip preaching the
things concerning the kingdom of God, and
the name of Jesus Christ, they were baptized, both men and women.”
Acts 8:12 KJV
“Then Peter said unto them, Repent, and
be baptized every one of you in the name of Jesus Christ for the remission of sins,
and ye shall receive
the gift of the Holy Ghost.”
Acts 2:38 KJV
“
This is the stone which was set at nought of you builders, which is become the head of the corner.
Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.”
Acts 4:11-12 KJV
“For there are three that bear record in heaven,
the Father,
the Word, and
the Holy Ghost: and
these three are one.”
1 John 5:7 KJV
“In the beginning was
the Word, and the Word was with God, and
the Word was God. The same was in the beginning with God.
In him was life; and the life was the light of men. That was
the true Light, which lighteth every man that cometh into the world. He was in the world, and the world was made by him, and the world knew him not.
But
as many as received him, to them gave he power to become the sons of God, even to them that believe on his name: which were
born, not of blood, nor of the will of the flesh, nor of the will of man, but
of God.
And
the Word was made flesh, and dwelt among us, full of grace and truth.”
John 1:1-2, 4, 9-10, 12-14 KJV
“the Father, the Word, and
the Holy Ghost: and
these three are one.”
“I and my Father are one.”
John 10:30
“Know ye not that ye are the temple of God, and that
the Spirit of God dwelleth in you?”
1 Corinthians 3:16 KJV
“But ye are not in the flesh, but in
the Spirit, if so be that
the Spirit of God dwell in you. Now if any man have not
the Spirit of Christ, he is none of his.”
Romans 8:9 KJV
“And when
Jesus had cried with a loud voice, he said,
Father, into thy hands I commend my spirit: and having said thus,
he gave up the ghost.”
Luke 23:46 KJV
“This
Jesus hath God raised up, whereof we all are witnesses. Therefore
being by the right hand of God exalted, and having
received of the Father the promise of the Holy Ghost, he hath shed forth this, which ye now see and hear.”
Acts 2:32-33 KJV
“And because ye are sons,
God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father.”
Galatians 4:6 KJV
Of course the father son and holy ghost are present with Jesus in the gospel it’s true of everything he taught also
“He that loveth me not keepeth not
my sayings: and the word which ye hear is not mine, but
the Father's which sent me. But the Comforter, which is the
Holy Ghost, whom the Father will send in my name, he shall
teach you all things, and
bring all things to your remembrance, whatsoever I have said unto you.”
John 14:24, 26 KJV
It’s always the father son and Holy Ghost when dealing with Jesus that’s what set him apart from everyone else in scripture he is the one