Historical Rules · 1 February 2010
Rule 113.3
Official source text from the 1 February 2010 Rules release
The same target can't be chosen multiple times for any one instance of the word "target" on a spell or ability. If the spell or ability uses the word "target" in multiple places, the same object, player, or zone can be chosen once for each instance of the word "target" (as long as it fits the targeting criteria).