1 Timothy 3:15 - But if I tarry long, that thou mayest know how thou oughtest to behave thyself in the house of God, which is the church of the living God, the pillar and ground of the truth.
John 21:25 - And there are also many other things which Jesus did, the which, if they should be written every one, I suppose that even the world itself could not contain the books that should be written. Amen.
Luke 24: 27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself. 28 And they drew nigh unto the village, whither they went: and he made as though he would have gone further. 29 But they constrained him, saying, Abide with us: for it is toward evening, and the day is far spent. And he went in to tarry with them. 30 And it came to pass, as he sat at meat with them, he took bread, and blessed it, and brake, and gave to them. 31 And their eyes were opened, and they knew him; and he vanished out of their sight
Luke 24:44And he said unto them, These are the words which I spake unto you, while I was yet with you, that all things must be fulfilled, which were written in the law of Moses, and in the prophets, and in the psalms, concerning me. 45 Then opened he their understanding, that they might understand the scriptures,
none of these explainations are in written Scripture, they are part of the deposit of faith within the Catholic Church