Mark 10:18

Jesus answered him, "Why are you calling me good? Nobody is good except One, that is, God.

Matthew 19:17

Jesus answered him, "Why do you ask me about what is good? There is [only] One who is good [i.e., God]. But if you want to enter [never ending] life, [then] obey His commandments."

Luke 18:19

Jesus answered him, "Why do you call me 'good'? No one is good except God only.

John 5:41-44

"I do not accept honor from mankind,

Romans 3:12

Everyone has turned away [from God]. All of them have become worthless. No one is [always] kind; no, not even one person."

James 1:17

Every good thing that is given and every perfect gift [received] is from above, coming down from the Father of [heavenly] lights, with whom there can be no change or shifting shadow [i.e., God always remains the same].

1 John 4:8

The person who does not love [others] does not know God [as Savior], for [the very nature of] God is love.

1 John 4:16

And we have known [with certainty] and have believed [with assurance] that God has truly loved us. God's [very nature] is love and the person who [continually] loves [Him and others] lives in [fellowship with] God [continually], and God [continually] lives in that person's heart.

Treasury of Scripture Knowledge

Summary

And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God.

Bible References

Why

Matthew 19:17
Jesus answered him, "Why do you ask me about what is good? There is [only] One who is good [i.e., God]. But if you want to enter [never ending] life, [then] obey His commandments."
Luke 18:19
Jesus answered him, "Why do you call me 'good'? No one is good except God only.
John 5:41
"I do not accept honor from mankind,
Romans 3:12
Everyone has turned away [from God]. All of them have become worthless. No one is [always] kind; no, not even one person."

That is

James 1:17
Every good thing that is given and every perfect gift [received] is from above, coming down from the Father of [heavenly] lights, with whom there can be no change or shifting shadow [i.e., God always remains the same].
1 John 4:8
The person who does not love [others] does not know God [as Savior], for [the very nature of] God is love.