Bible and also Tradition required.

1 Cor 11:2; -- hold fast to traditions I handed on to you


2 Thess 2:15; -- hold fast to traditions, whether oral or by letter

2 Thess 3:16; -- shun those acting not according to tradition

Jn 21:25; -- not everything Jesus said is recorded in Scripture

Mk 13:31; -- heaven and earth shall pass away, but My Word won't

Acts 20:35; -- saying of Jesus not recorded in the gospels

2 Tim 1:13; -- follow my sound words; guard the truth

2 Tim 2:2: -- what you heard, entrust to faithful men

2 Pet 1:20; -- no prophecy is a matter of private interpretation

2 Pet 3:15-16; -- Paul's letters can be difficult to grasp and interpret

1 Pet 1:25; -- God's eternal Word is the Word preached by you

Rom 10:17; -- faith comes from what is heard

1 Cor 15:1-2; -- being saved if you hold fast to the word I preached

Mk 16:15; -- go to the whole world, proclaim the gospel to every creature

Mt 23:2-3; -- chair of Moses; observe whatever they tell you

Mt 15:3; -- break commandment of God for your tradition

Mk 7:9; -- set aside God's commandment to uphold tradition

Col 2:8; -- seductive philosophy according to human tradition

1 Cor 11:2; -- commends them for following Apostolic tradition

2 Thess 2:15; -- commands them to keep traditions

2 Thess 3:16; -- shun those acting not according to tradition