What angels are according to the Bahai faith

" By "angels" is meant those who, reinforced by the power of the spirit, have consumed, with the fire of the love of God, all human traits and limitations, and have clothed themselves with the attributes of the most exalted Beings and of the Cherubim... And now, inasmuch as these holy beings have sanctified themselves from every human limitation, have become endowed with the attributes of the spiritual, and have been adorned with the noble traits of the blessed, they therefore have been designated as "angels."

(Baha'u'llah, The Kitab-i-Iqan, p. 78)

The meaning of 'angels' is the confirmations of God and His celestial powers. Likewise angels are blessed beings who have severed all ties with this nether world, have been released from the chains of self and the desires of the flesh, and anchored their hearts to the heavenly realms of the Lord.These are of the Kingdom, heavenly; these are of God, spiritual; these are revealers of God's abounding grace; these are dawning-points of His spiritual bestowals.
(Abdu'l-Baha, Selections from the Writings of Abdu'l-Baha, p. 80)

By 'angel' is meant the power of the confirmations of God -- that the candle of God's confirming power shineth out from the lamp-niche of those souls -- meaning that every one of those beings will be granted the most vehement confirming support.

When praiseworthy qualities and high morals emanate from man, he becometh a heavenly being, an angel of the Kingdom, a divine reality and a celestial effulgence.
(Abdu'l-Baha, Selections from the Writings of Abdu'l-Baha, p. 286)

http://bahaimosaic.blogspot.no/2012/11/the-meaning-of-angels.html