.zshenv:2: command not found: rbenv

When switching from bash to zsh, I looked up how to resolve an issue with my rbenv folder not being used correctly by zsh and found this:

$ echo 'export PATH="$HOME/.rbenv/bin:$PATH"'>> ~/.zshenv$ echo 'eval "$(rbenv init -)"'>> ~/.zshenv$ echo 'source $HOME/.zshenv'>> ~/.zshrc$ exec $SHELL

I ran all of these and seem to be using the correct rbenv folder now, but I get this error message whenever I open a new iTerm window:

/Users/myname/.zshenv:2: command not found: rbenv

What am I doing wrong? Any help would be very appreciated.