It's clearly enough in Scripture ... in fact it's the very centre of the whole thing:
"And now there remain faith, hope, and charity, these three: but the greatest of these is charity." 1 Corinthians 13:13.
Jesus Himself said so in His commentary on the Shema Israel — He gave it as a new commandment.
Scripture says so in Matthew 24:10, Mark 12:33, John 13:14, 13:34, 13:35, 14:13, 14:23, 15:7, 15:12, 15:17. Paul in Romans 12:10, 13:8, 15:14, 16:16, 1 Corinthians 7:5, 11:33, 13:33, 16:20, 2 Corinthians 13:12, Galatians 5:13, 6:2, Ephesians 4:2, 4:32, Colossians 3:13, 3:16 1 Thessalonians 3:12, 4:17, 5:11,
Hebrews 10:24, 10:25, James 4:11, Peter in 1 Peter 1:22, 5:14, 1 John in 3:11, 3:23, 4:7, 4:11, 4:12, 2 John 1:5 ...
1 Corinthians 13:13 sums it up:
"And now there remain faith, hope, and charity, these three: but the greatest of these is charity."