Where can you find the scripture of Jesus going to hell to get the keys?

There is no scripture that deals with Jesus going to hell to get the keys to the kingdom.

When Jesus said (Matt. 16:17-19) that he was giving Peter the keys to the kingdom of heaven, he was using a metaphor, not referring to literal keys.

Jesus was declaring that Peter would be the one to bring the good news to the people, and explain to the people how they could go to heaven. That prophecy was fulfilled at Pentecost, when Peter preached the gospel to thousands of people, and large numbers accepted his message.

Some years later, Peter again demonstrated that Jesus had given him the power of "binding and loosing" when Peter established (under the power of the Holy Spirit working in him) the rule that non-Jews could enter the kingdom of heaven without being required to accept the Jewish law, or to become Jewish proselytes.