You MUST Test the Holy Prophets (Peace Be Upon Him), means test the Quraan:

1 John_4:1
Beloved, believe not every Spirit (Prophet {Peace Be Upon Him}), but (MUST) test the spirits (Prophets {Peace Be Upon Him}) whether they are of God: because many (NOT ALL) false prophets are gone out into the world.

(Remember: You must TEST the Quraan, otherwise it will be unjust and not fare and against the teaching of the Bible).

Muhammad (Peace Be Upon Him) like Moses (Peace Be Upon Him) in the Bible:

Act_3:22
For Moses (Peace Be Upon Him) truly said unto the Fathers, A prophet (Peace Be Upon Him) shall the Lord your God raise up unto you of your brethren, like unto me (Peace Be Upon Him); him shall ye hear in all things whatsoever he shall say unto you.
(Remember: Moses {Peace Be Upon Him} had a biological Father and a Mother and same is true for Muhummed {Peace Be Upon Him} and also have complete holy book the Quraan (like Old Testament).

Muhammad (Peace Be Upon Him) in the Bible:

John_14:16
And I (Peace Be Upon Him) will pray the Father, and he shall give you another Comforter (Spiritual Helper, a Prophet {Peace Be Upon Him}), that he may abide with you for ever (means: the Quraan);

[Remember: Here we Muslim can easily understand that Jesus (Peace Be Upon Him) is a Prophet {Peace Be Upon Him} (Helper) and foretelling their people about coming of another Prophet {Peace Be Upon Him} (Helper) Muhummad (Peace Be Upon Him) and the Quraan will abide with us for ever].

John_14:25
These things have I (Peace Be Upon Him) spoken unto you, being [yet] present with you.

John_14:26
But the Comforter (Spiritual Helper, a Prophet {Peace Be Upon Him}), [which is] the Holy Ghost (Prophet {Peace Be Upon Him}), whom the Father will send in my name, He (Peace Be Upon Him) shall teach you all things, and bring all things to your remembrance, whatsoever I (Peace Be Upon Him) have said unto you.

For more on Muhammad (Peace Be Upon Him) in the Bible:

John 8:32, 1 John_14:26, 1 John_4:1, 1 John_4:2, Act_3:22, John_14:16, John_14:25, John_14:26, John_14:27, John_14:28, John_14:29, John_14:30, John_15:26, John_16:6, John_16:7, John_16:8, John_16:9, John16:10, John_16:11, John_16:12, John_16:13, John_16:14