Analysis of information sources in references of the Wikipedia article "Communion of saints" in English language version.
The opinion of the Rev. John Wesley may be worth citing. 'I believe it to be a duty to observe, to pray for the Faithful Departed.'
Wesley taught the propriety of Praying for the Dead, practised it himself, provided Forms that others might. These forms, for daily use, he put fort, not tentatively or apologetically, but as considering such prayer a settled matter of Christian practice, with all who believe that the Faithful, living and dead, are one Body in Christ in equal need and like expectation of those blessings which they will together enjoy, when both see Him in His Kingdom. Two or three examples, out of many, may be given:–'O grant that we, with those who are already dead in Thy faith and fear, may together partake of a joyful resurrection.'