I know there is

1. Ruth 4: 4
     4 And I thought to advertise thee, saying, Buy it before the inhabitants, and before the elders of my people. If thou wilt redeem it, redeem it: but if thou wilt not redeem it, then tell me, that I may know: for there is none to redeem it beside thee; and I am after thee. And he said, I will redeem it.
2. 2 Kgs. 5: 15
     15 ¶ And he returned to the man of God, he and all his company, and came, and stood before him: and he said, Behold, now I know that there is no God in all the earth, but in Israel: now therefore, I pray thee, take a blessing of thy servant.
3. Eccl. 3: 12
     12 I know that there is no good in them, but for a man to rejoice, and to do good in his life.
4. Jacob 7: 9, 12
     9 And I said unto him: Deniest thou the Christ who shall come? And he said: If there should be a Christ, I would not deny him; but I know that there is no Christ, neither has been, nor ever will be.
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     12 And this is not all—it has been made manifest unto me, for I have heard and seen; and it also has been made manifest unto me by the power of the Holy Ghost; wherefore, I know if there should be no atonement made all mankind must be lost.
5. Alma 30: 39
     39 Now Alma said unto him: Will ye deny again that there is a God, and also deny the Christ? For behold, I say unto you, I know there is a God, and also that Christ shall come.