I am true to the Lord my God with all my heart.

Be true to the Lord your God with all your heart.

My brothers, however, who went up with me, made the heart of the people like water: but I was true to the Lord with all my heart.
Joshua 14:8

And on that day Moses took an oath, saying, Truly the land where your feet have been placed will become a heritage for you and your children for ever, because you have been true to the Lord your God with all your heart.
Joshua 14:9

Jos 14:10 And now, as you see, the Lord has kept me safe these forty-five years, from the time when the Lord said this to Moses, while Israel was wandering in the waste land: and now I am eighty-five years old.
Jos 14:11 And still, I am as strong today as I was when Moses sent me out: as my strength was then, so is it now, for war and for all the business of life.
Jos 14:12 So now, give me this hill-country named by the Lord at that time; for you had an account of it then, how the Anakim were there, and great walled towns: it may be that the Lord will be with me, and I will be able to take their land, as the Lord said. 1)Rom 8:31 What may we say about these things? If God is for us, who is against us? 2)Php 4:13 I am able to do all things through him who gives me strength. 3)Heb 11:33 Who through faith overcame kingdoms, did righteousness, got their reward, kept the mouths of lions shut,
Heb 11:34 Put out the power of fire, got safely away from the edge of the sword, were made strong when they had been feeble, became full of power in war, and put to flight the armies of the nations.

Jos 14:13 And Joshua gave him his blessing; and he gave Hebron to Caleb, the son of Jephunneh, for his heritage.
Jos 14:14 So Hebron became the heritage of Caleb, the son of Jephunneh the Kenizzite, to this day, because with all his heart he was true to the Lord, the God of Israel.

References
1Rom 8:31 What may we say about these things? If God is for us, who is against us?
2Php 4:13 I am able to do all things through him who gives me strength.
3Heb 11:33 Who through faith overcame kingdoms, did righteousness, got their reward, kept the mouths of lions shut,
Heb 11:34 Put out the power of fire, got safely away from the edge of the sword, were made strong when they had been feeble, became full of power in war, and put to flight the armies of the nations.