Pasa (H6585) means to step, stride, or march — often with the connotation of decisive forward movement. It appears in 2 Samuel 6:13 when the bearers of the Ark took six steps, and in descriptions of bold advance. The same root underlies pasach (Passover — 'to pass over/stride over').
Six steps of the Ark, and David sacrificed (2 Sam 6:13) — this interval worship is a window into the theology of sacred advance. Every advance of God's presence is marked with sacrifice. The word pasa shares its root with the Passover (pesach) — where God 'stepped over' (pasach) the marked houses. Forward movement in God's economy requires blood-covered ground. The Christian parallel is profound: in Christ's atoning work, God strides over judgment to bring His people into the promised land of salvation.