Is the Lord’s Supper only for Christians? Whenever I ask this question I immediately remember the character of those that partook of the Last Supper with Jesus. They were certainly Jews, some better Jews than others, but Jesus shared this meal knowingly even with Judas. Or again consider the Emmaus Road encounter. Jesus shares this meal with those who had given up on his being the One to redeem Israel, who were leaving Jerusalem downcast and disappointed, and who were oblivious to the fact that it was Jesus who was speaking and sharing with them! There has to be a balance in the liturgy to help the congregation make a decision if they themselves are ready to partake of this Meal in a worthy manner (hence the 'ye who do truly and earnestly repent' clause), while at the same time joyfully welcoming all who are willing and ready and able to do so.
Ben Witherington III, Making a Meal of It: Rethinking the Theology of the Lord's Supper
church, communion, eucharist, sacrament, the-lord-s-supper