PSALM 51.10-12
Create for me a clean heart, O God, || And renew a right spirit within me. Do not cast me forth from Your presence, || And do not take Your Holy Spirit from me. Restore to me the joy of Your salvation, || And a willing spirit sustains me.
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MATTHEW 6.6
But you, when you may pray, go into your chamber, and having shut your door, pray to your Father who [is] in secret, and your Father who is seeing in secret will reward you.
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HEBREWS 7.22
by so much also has Jesus become guarantee of a better covenant,
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EPHESIANS 6.17
and receive the helmet of the salvation, and the sword of the Spirit, which is the word of God,