From ‘Whole Bible Christianity’ chapter 3 section on The Presence of the Holy Spirit
Some argue that the Spirit didn’t ‘fill’ or ‘dwell in’ believers until the first Pentecost (Hebrew Shavuot) after the resurrection of the Messiah. But even a quick look at the Word proves this to be false. The list of people in the OT directly said to be filled with and/or led by the Spirit is long and distinguished. It is clear in the plain meaning of the text that there is very little difference, if any at all, between leading and filling.
Bezalel (Exodus 31:3 and 35:31)
Moses and the 70 Elders (Numbers 11:17, 25, 26, 29)
Balaam (Numbers 24:2)
Joshua (Numbers 27:18 and Deuteronomy 34:9)
Othniel son of Joshua (Judges 3:10)
Gideon (Judges 6:34)
Jephthah (pronounced Yayftah – Judges 11:29)
Samson (Judges 13:25, 14:6&19, 15:14)
King Saul (1 Samuel 10:6, 10, 11:6)
King David (1 Samuel 16:13)
Messengers of Saul (I Samuel 19:20)
Amasai, chief of the 30 (1 Chronicles 12:18)
Azariah son of Obed (2 Chronicles 15:1)
Jahaziel (2 Chronicles 20:14)
The Branch (Isaiah 11:2); My Servant (Isaiah 42:1); the Anointed (Isaiah 61:1)
The people of Israel (Isaiah 63:11)
Ezekiel (Ezekiel. 2:2, 3:12, 14, 24, 11:5)
Micah (Micah 3:8)
Zerubbabel, Joshua, and the people of the land (Haggai 2:5)
The former prophets (Zechariah 7:12)
There are also a number of Scriptures that explicitly state that Old Testament saints had the Spirit (such as Isaiah 63:10-14; 1 Peter 1:11). The presence of the Spirit is not marked only by speaking in other languages or with miraculous actions, or even by prophetic signs and utterances. His primary mark is on a heart that responds to God in trusting and loving obedience. God’s Spirit is all around and works to varying degrees depending on the willingness of people to work with Him.
He may sometimes work in spectacular ways, but that is not the only way He works. For instance, He can be present without salvation, as He is in creation. He makes seeds grow and keeps air on our planet with gravity. The planets revolve and orbit the sun by His hand. The only place He has trouble getting His way is in the human heart.