Hebrews 1:1-2
Long ago, at many times and in many ways, God spoke to our fathers by the prophets, but in these last days he has spoken to us by his Son, whom he appointed the heir of all things, through whom also he created the world.
God speaks to us through his Word Jesus Christ
25 “All this I have spoken while still with you. 26 But the Advocate,(S) the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you. 27 Peace I leave with you; my peace I give you. I do not give to you as the world gives. Do not let your hearts be troubled and do not be afraid.
28 “You heard me say, ‘I am going away and I am coming back to you.’ If you loved me, you would be glad that I am going to the Father, for the Father is greater than I. 29 I have told you now before it happens, so that when it does happen you will believe. 30 I will not say much more to you, for the prince of this world is coming. He has no hold over me, 31 but he comes so that the world may learn that I love the Father and do exactly what my Father has commanded me.
- Gospel of St John
Before Jesus left He promised his followers the Holy Spirit.