As per Ordo (Order) of SACBC this week in the dioceses of Southern Africa it is celebrated the week of prayer for Christian unity.

At every celebration of the Eucharist, the Church prays for unity and peace, mindful of the Jesus prayer. “May they all be one. Father, may they be one in us, as you are in me and I am in you, so that the world may believe that it was you who sent me” (John 17,21) The Missale Romanum contains three Masses – among those for various needs – “for Christian unity”. The same intention is remembered in the intercessions of the Liturgy of the Hours”.

In deference to the sensibilities of the “separated brethren” (203), expressions of popular piety should take into account the principle of ecumenism. Effectively, “change of heart and holiness of life, along with public and private prayer for the unity of Christians, should be regarded as the soul of the whole ecumenical movement, and merits the name “spiritual ecumenism”. The encounter of Catholics with Christians from other Churches or ecclesial communities affords a special occasion for common prayer for the grace of Christian unity, to offer to God their common anxieties, to give thanks to God and to implore his assistance. “Common prayer is particularly recommended during the “Week of Prayer for Christian Unity” or during the period between Ascension and Pentecost”. Prayer for Christian unity also carries several indulgences. Directory of Pious Practices, #182