Deuteronomy 7:9

Therefore know that the Lord your God, He is God, the faithful God who keeps covenant and mercy for a thousand generations with those who love Him and keep His commandments.

God is faithful to all those who believe in Him and follow His commandments.  His word does not come back to Him void as we put into action all God’s promises when we speak blessing, healing, and prosperity into our lives.  God keeps His covenant with us and with all those who love Him and study the word to know Him.