Psalm 1
The Psalter opens by contrasting the righteous tree with wind-blown chaff.
As the opening psalm, Psalm 1 sets the tone for the whole book: the blessed man avoids the counsel of the ungodly and instead delights in God's law, becoming 'like a tree planted by the rivers of water.' See how the theme develops in Psalms 2.
Blessed is the man who does not walk in the counsel of the wicked, or set foot on the path of sinners, or sit in the seat of mockers.
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, yielding its fruit in season, whose leaf does not wither, and who prospers in all he does.
Not so the wicked! For they are like chaff driven off by the wind.
Therefore the wicked will not stand in the judgment, nor sinners in the assembly of the righteous.
For the LORD guards the path of the righteous, but the way of the wicked will perish.