Blessed is the man who walks not in the counsel of the wicked, nor stands in the way of sinners, nor sits in the seat of scoffers; but his delight is in the law of the Lord, and on his law he meditates day and night.
He is like a tree planted by streams of water that yields its fruit in its season, and its leaf does not wither. In all that he does, he prospers. The wicked are not so, but are like chaff that the wind drives away.
Therefore the wicked will not stand in the judgment, nor sinners in the congregation of the righteous; for the Lord knows the way of the righteous, but the way of the wicked will perish. Psalm 1 (ESV)
The Psalms are prayers and songs- some of praise and worship, and others of supplication and mourning. Still others, such as Psalm 22, are prophetic and speak of the humanity as well as particular details of the passion of Christ. All of the Psalms point us to Jesus in one way or another.
Psalm 1 is a description of Jesus- the person who lives perfectly according to God’s Law. We, of course, cannot do that.
Even though we are not capable of living as Jesus lived, we can still look to His example as the Author and Perfecter of our faith. (Hebrews 12:1-2)
Because we belong to Jesus, we are not counted among the wicked in the judgment. Because Jesus was that man who delighted in God’s law and lived perfectly sin-free in our place; the God-man who died as a perfect sacrifice for our sins, we are judged as though we lived with HIS perfection instead of our own wickedness and sins.
Thanks be to God that when the judgment comes we who believe in Him and trust Him for the forgiveness of our sins will be judged on the merits of Jesus and considered to be His saints.