Fr Joseph Okere's remarks are not known exactly but social media suggests he spoke about Ireland's gay marriage referendum.
In May people in the country backed legalising same sex marriage by 62 per cent.
Fr Okere is thought to have said the vote was the work of the Devil and those that backed the proposal were worshippers of Satan, during his Homily at Saint Mel's Cathedral in Longford.
Bishop Francis Duffy, Bishop of Ardagh and Clonmacnois, apologised for the comments.
He said: "The language used caused offence to some people. Father Joseph did not intend to hurt anyone and is sorry for doing so. I too apologise for any insensitivity.
"As Pope Francis said yesterday in his homily at the opening the Synod of Bishops on the family, we must "reach out to others with true love, to walk with our fellow men and women who suffer, to include them and guide them to the wellspring of salvation".
"During May, in my own public statements in support of the sacrament of marriage, I emphasised the dignity that is inherent in all people, whatever their sexuality; and the necessity for the Church to reaffirm its determination to welcome, and show respect and compassion, to everyone in our community."