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ὑμῖν

Ἐς δὲ τὰ ἔσχατα νουσήματα αἱ ἔσχαται θεραπεῖαι ἐς ἀκριβείην, κράτισται -> For extreme diseases, extreme methods of cure, as to restriction, are most suitable.
Corpus Hippocraticum, Aphorisms 1.6.2

French (Bailly abrégé)

dat. de ὑμεῖς.

English (Strong)

irregular dative case of ὑμεῖς; to (with or by) you: ye, you, your(-selves).

Russian (Dvoretsky)

ὑμῖν: dat. к ὑμεῖς.