μά
A particle used in affirmations or strong protestations, followed by acc. of a deity or thing invoked. Affirmatively with ναί · ναὶ μὰ τόδε σκῆπτρον (by this...) Il. 1.234.
With οὐ in negation : οὐ μὰ ζῆνα Il. 23.43. Cf. Il. 1.86 : Od. 20.339.