John 4:24 – God is a Spirit: and they that worship him must worship him in spirit and in truth.
Acts 2:4 – And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
Rom 8:26-27 – Likewise the Spirit also helpeth our infirmities: for we know not what we should pray for as we ought: but the Spirit itself maketh intercession for us with groanings which cannot be uttered. And he that searcheth the hearts knoweth what is the mind of the Spirit, because he maketh intercession for the saints according to the will of God.
1 Corinthians 14:2 – For he that speaketh in an unknown tongue speaketh not unto men, but unto God: for no man understandeth him; howbeit in the spirit he speaketh mysteries.
1 Corinthians 14:4 – He that speaketh in an unknown tongue edifieth himself; but he that prophesieth edifieth the church.
1 Cor 14:14-15 – For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful. What is it then? I will pray with the spirit, and I will pray with the understanding also: I will sing with the spirit, and I will sing with the understanding also.
Eph 6:18 – Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
Jude 1:20 – But ye, beloved, building up yourselves on your most holy faith, praying in the Holy Ghost,