Numbers 11:29 New International Version (NIV)
29 But Moses replied, “Are you jealous for my sake? I wish that all the Lord’s people were prophets and that the Lord would put his Spirit on them!”
Moses was looking forward to the day when all God’s people would experience the pouring out of God’s Spirit. This was fulfilled at Pentecost in Acts. Believers can be sure that they have the Holy Spirit when they become Christian. You can pray to live by the Holy Spirit’s power. If you wish to have the Holy Spirit’s power, pray for him to fill your life with his presence and strengthen you as you follow Christ.