yodan verb with 'ru' ending (archaic), auxiliary verb
Archaic honorific auxiliary verb, equivalent to modern なさる. Attaches to the continuative form (連用形) of verbs. Found in classical or highly formal historical texts.
See also: なさる
「お待ちなはれ」は古風な尊敬表現で、現代では「お待ちなさい」にあたる。
「お待ちなはれ」 is an old-fashioned respectful expression, corresponding to modern 「お待ちなさい」.