In Genesis 28, as Jacob left home for fear of his life, God encountered him at Bethel. There, God assured Jacob that he was still his God, despite his sin, and would bring him back. Jacob set up a stone of remembrance there to remember and recall God's faithfulness.
On Pentecost, God, the Holy Spirit, came to the disciples just as Jesus had promised. On this festival day, we commemorate the coming of the Holy Spirit to the disciples by setting up a stone of remembrance to the God who still comes to meet us. Genesis 28:10-22