What is "Ish Midah"?
'Rashi', Radak: This is [big], like "Anshei Midos" (Bamidbar 13:32). 'Rashi' - he is called Ish Midah because he was so big that one must measure 1 him.
Rashi (Shmuel II, 21:20): He is very tall; people estimate his height.
Why does it say that his fingers were six and six, 24?
'Rashi', Radak, Rashi (Shmuel 21:20), from Bechoros 45b: Had it not written 24, one might have thought that he has a total of six fingers and six toes. Had it written only 24, one might have thought that he has seven in this hand and five on this. 'Rashi' - because each hand had six fingers, he could hold a sword very strongly.
Who is "leha'Rafa"?
Radak (here and Shmuel II, 21:20): It is 'to the giant.' Rafa is his father, is one of the Refa'im. Sometimes there is a Hei at the end; Aleph and Hei are interchangeable. The prefix Lamed is properly together with the prefix Hei, just usually the Hei is omitted for ease [of pronunciation]. Also elsewhere it is not omitted, e.g. "leha'Am ha'Zeh", "leha'Gedud" (Divrei ha'Yamim II, 10,7, 25:10).
According to Sanhedrin 95a, it is 'to Harafah' (also called Orpah). (PF)
