Where in the Bible are there passages that back up these 2 claims about God.
Omniscience:
Psalm 147:5
Great is our Lord, and abundant in power; his understanding is beyond measure.
1 John 3:20
For whenever our heart condemns us, God is greater than our heart, and he knows everything.
John 21:17
He said to him the third time, “Simon, son of John, do you love me?” Peter was grieved because he said to him the third time, “Do you love me?” and he said to him, “Lord, you know everything; you know that I love you.” Jesus said to him, “Feed my sheep."
Job 36:3-5
I will get my knowledge from afar and ascribe righteousness to my Maker. For truly my words are not false; one who is perfect in knowledge is with you. “Behold, God is mighty, and does not despise any; he is mighty in strength of understanding."
Job 37:15-16
Do you know how God lays his command upon them and causes the lightning of his cloud to shine? Do you know the balancings of the clouds, the wondrous works of him who is perfect in knowledge,
1 Samuel 2:3
Talk no more so very proudly, let not arrogance come from your mouth; for the Lord is a God of knowledge, and by him actions are weighed.
Omnipotence:
Matthew 19:26
But Jesus looked at them and said, “With man this is impossible, but with God all things are possible.”
Luke 1:37
"For nothing will be impossible with God.”
Jeremiah 32:27
“Behold, I am the Lord, the God of all flesh. Is anything too hard for me?
Job 42:2
“I know that you can do all things, and that no purpose of yours can be thwarted."
Mark 10:27
Jesus looked at them and said, “With man it is impossible, but not with God. For all things are possible with God.”
Mark 14:36
And he said, “Abba, Father, all things are possible for you. Remove this cup from me. Yet not what I will, but what you will.”
Revelation 1:8
“I am the Alpha and the Omega,” says the Lord God, “who is and who was and who is to come, the Almighty.”