mod rewrite loop

Hi,

I want all incoming requests to page.html to get its content from
page.php.
At the same time I want all incoming requests to page.php to be 301
redirected to page.html
How should such rules look like?

I tried with the rules below does give me an error if I combine them
two

RewriteRule ^page\.html$ page.php [L]
RewriteRule ^page\.php$ /page.html [R=301,L]


//rikard