Did Moses Change God's Mind

Numbers 14:19 "Pardon the iniquity of this people, I pray, according to the greatness of Your mercy, just as You have forgiven this people, from Egypt even until now.” 20. Then the Lord said: “I have pardoned, according to your word.”  

Once again the children of Israel murmured against Moses and Aaron, and said to them, If only we had died in the land of Egypt! Or if only we had died in this wilderness! They were despising all of the wonderful miracles God had performed to get them out of slavery. 

They next decided to forget God’s leader, and pick a different one. Moses, Aaron, Joshua and Caleb tried to make the people change their minds, but they were not willing to obey. 

Then the Lord asked, “How long will these people reject Me?” “I will strike them with the pestilence and disinherit them.” Moses began to intercede for them. Then the Lord said: “I have pardoned, according to your word.”