Here are 6 Bible verses about decisiveness from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Joshua 24:15-16 KJV
And if it seem evil unto you to serve the LORD, choose you this day whom ye will serve; whether the gods which your fathers served that were on the other side of the flood, or the gods of the Amorites, in whose land ye dwell: but as for me and my house, we will serve the LORD. And the people answered and said, God forbid that we should forsake the LORD, to serve other gods;
Hebrews 11:24-25 KJV
By faith Moses, when he was come to years, refused to be called the son of Pharaoh’s daughter; Choosing rather to suffer affliction with the people of God, than to enjoy the pleasures of sin for a season;
Ruth 1:15-18 KJV
And she said, Behold, thy sister in law is gone back unto her people, and unto her gods: return thou after thy sister in law. And Ruth said, Intreat me not to leave thee, or to return from following after thee: for whither thou goest, I will go; and where thou lodgest, I will lodge: thy people shall be my people, and thy God my God: Where thou diest, will I die, and there will I be buried: the LORD do so to me, and more also, if ought but death part thee and me. When she saw that she was stedfastly minded to go with her, then she left speaking unto her.
Daniel 1:8 KJV
But Daniel purposed in his heart that he would not defile himself with the portion of the king’s meat, nor with the wine which he drank: therefore he requested of the prince of the eunuchs that he might not defile himself.
Daniel 6:10 KJV
Now when Daniel knew that the writing was signed, he went into his house; and his windows being open in his chamber toward Jerusalem, he kneeled upon his knees three times a day, and prayed, and gave thanks before his God, as he did aforetime.
Genesis 39:10-12 KJV
And it came to pass, as she spake to Joseph day by day, that he hearkened not unto her, to lie by her, or to be with her. And it came to pass about this time, that Joseph went into the house to do his business; and there was none of the men of the house there within. And she caught him by his garment, saying, Lie with me: and he left his garment in her hand, and fled, and got him out.