Luke 24:49 Behold, I send the Promise of My Father upon you; but tarry in the city of Jerusalem until you are endued with power from on high.
Knowing He was about to depart, Yeshua (Jesus) left His disciples with a final command: stay in Jerusalem, and wait...for the promise. Of the thousands who had witnessed His miraculous ministry and heard His amazing teaching and the hundreds that had actually seen Him after the resurrection, we read in Acts that only 120 stayed and tarried until the promise arrived. But these 120 were steadfast. They waited the full term...
What would have happened if they had left after the 4th day? Or the 6th day? Or the 9th day? They would have missed the promise and the amazing blessing that came with it. But those 120 believers stayed - they stayed and pressed in until the Holy Spirit came!
Do you want the fullness of the Spirit in your life? Continue pressing in. Wait with relentless faith and patience. Perseverance is often the critical factor in receiving the promises of God. Our Lord will fulfill every good promise in His perfect time.