And the Spirit of the LORD shall rest upon him,

1. the Spirit of wisdom and understanding,
2. the Spirit of counsel and might,
3. the Spirit of knowledge and the fear of the LORD.

-- Isaiah 11:1-2 (ESV)

The number 3 means: unity

And Peter said to them, "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit." -- Acts 2:38 (ESV)

1. For to one is given the word of wisdom through the Spirit,
2. to another the word of knowledge through the same Spirit,
3. to another faith by the same Spirit,
4. to another gifts of healings by the same Spirit,
5. to another the working of miracles,
6. to another prophecy,
7. to another discerning of spirits,
8. to another different kinds of tongues,
9. to another the interpretation of tongues.

-- 1 Corinthians 12:8-10 (NKJV)

In this context one could consider the number 9 means: restore unity

These gifts can be grouped in 3 groups of 3 gifts each:

1. Decision-making: wisdom, knowledge, faith
2. Might: healing, miracles, prophecy
3. Knowing the LORD: spiritual discernment, speaking and interpreting tongues

These 3 groups correspond to Isaiah 11:1-2 mentioned above.