righteousness

Kingdom of God is not eating and drinking

For if because of food your brother is hurt, you are no longer walking according to love. Do not destroy with your food him for whom Christ died.

Therefore do not let what is for you a good thing be spoken of as evil;

for the kingdom of God is not eating and drinking, but righteousness and peace and joy in the Holy Spirit.

Romans 14:15-17 (NASB)

Salvation through faith

That if you confess with your mouth Jesus as Lord, and believe in your heart that God raised Him from the dead, you will be saved;

for with the heart a person believes, resulting in righteousness, and with the mouth he confesses, resulting in salvation.

Romans 10:9-10 (NASB)

Justified as a gift

But now apart form the Law the righteousness of God has been manifested, being witnessed by the Law and the Prophets,

even the righteousness of God through faith in Jesus Christ for all those who believe; for there is no distinction;

for all have sinned and fall short of the glory of God,

being justified as a gift by His grace through the redemption which is in Christ Jesus;

Romans 3:21-24 (NASB)

Milk or solid food?

For everyone who partakes only of milk is not accustomed to the word of righteousness, for he is an infant.

But solid food is for the mature, who because of practice have their senses trained to discern good and evil.

Hebrews 5:13-14 (NASB)

Practice righteousness

Little children, make sure no one deceives you; the one who practices righteousness is righteous, just as He is righteous;

the one who practices sin is of the devil; for the devil has sinned from the beginning. The Son of God appeared for this purpose, to destroy the works of the devil.

1 John 3:7-8 (NASB)