Bible readings (NIV):

28 “And afterward,
    I will pour out my Spirit on all people.
Your sons and daughters will prophesy,
    your old men will dream dreams,
    your young men will see visions.
29 Even on my servants, both men and women,
    I will pour out my Spirit in those days.
30 I will show wonders in the heavens
    and on the earth,
    blood and fire and billows of smoke.
31 The sun will be turned to darkness
    and the moon to blood
    before the coming of the great and dreadful day of the Lord.
32 And everyone who calls
    on the name of the Lord will be saved;
for on Mount Zion and in Jerusalem
    there will be deliverance,
    as the Lord has said,
even among the survivors
    whom the Lord calls.

Jesus Promises the Holy Spirit

15 “If you love me, keep my commands. 16 And I will ask the Father, and he will give you another advocate to help you and be with you forever— 17 the Spirit of truth. The world cannot accept him, because it neither sees him nor knows him. But you know him, for he lives with you and will be in you. 18 I will not leave you as orphans; I will come to you. 19 Before long, the world will not see me anymore, but you will see me. Because I live, you also will live. 20 On that day you will realize that I am in my Father, and you are in me, and I am in you. 21 Whoever has my commands and keeps them is the one who loves me. The one who loves me will be loved by my Father, and I too will love them and show myself to them.”

22 Then Judas (not Judas Iscariot) said, “But, Lord, why do you intend to show yourself to us and not to the world?”

23 Jesus replied, “Anyone who loves me will obey my teaching. My Father will love them, and we will come to them and make our home with them. 24 Anyone who does not love me will not obey my teaching. These words you hear are not my own; they belong to the Father who sent me.

25 “All this I have spoken while still with you. 26 But the Advocate, 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.