1 John 2:27 NIV
As for you, the anointing from him remains in you, and you do not need anyone to teach you. But as his anointing teaches you about all things and as that anointing is real, not counterfeit—just as it has taught you, remain in him.

1 John 2:20 NIV
But you have an anointing from the Holy One, and all of you know the truth.

In the OT Only three kinds of people were anointed

1. Priests
2. Kings
3. Prophets

But in the NT every believer is anointed when we accept Jesus as our Lord and Saviour and make a covenant with him in Baptism. God anoints us. In 1 John 2:27 and 1 John 2:20, John reveals God’s source of the anointing. John assures his readers that they already possess this anointing—there is no need to seek it—and that it is sufficient to instruct them in all they need to know.

Does the anointing imply that we require no teachers?

1 John 2:27 does not mean that, because John himself is teaching through the letters that he is writing.

In the context here, John is dealing with the issue of Gnosticism,

• the early church faced division caused by Gnostics.
• The Gnostics were primarily known for their dualistic views and claims of possessing special knowledge.
• They believed in the separation of the spiritual and material worlds, regarding the latter as evil.
• Consequently, they denied the incarnation of Christ and asserted that Jesus never came in the flesh. This explains John’s emphasis on the humanity of Jesus
• The purpose of God’s anointing is to safeguard genuine Christians from the teachings of false teachers.
• John describes the latter as antichrists and liars because they deny the complete truth about Jesus (1 John 2:22).
• However, all genuine Christians possess this anointing, which indicates that they have the truth.
• Thus, while the Gnostics lay claim to special knowledge, John reminds his readers that the anointing they possess is sufficient to teach them.
• There is no need to seek the esoteric ways of Gnosticism.

So this verse is an instruction that deals with the issue of Gnosticism in the church, not an instruction saying you don’t need teachers.