Oh no its not just old covenant stuff, its Gods Truth, and you shouldnt scoff it like that friend. Its scripture, show respect 2 Tim 3:16
All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness:
luke 24:44-45
44 And 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,
The Psalms are the scriptures, Ps 5:5
5 The foolish shall not stand in thy sight: thou hatest all workers of iniquity.