The texts assigned in the Revised Common Lectionary for Tuesday of Holy Week are Isaiah 49:1-7 (Servant mission in the world), Psalm 71:1-14 (they say, “God has abandoned him.”), 1 Corinthians 1:18-31 (cross is foolish to world, wisdom of God), and John 12:20-36 (Jesus speaks about his death).

John 12:23-26 (New Jerusalem Bible):

Jesus replied to them: Now the hour has come for the Son of man to be glorified. In all truth I tell you, unless a wheat grain falls into the earth and dies, it remains only a single grain; but if it dies it yields a rich harvest. Anyone who loves his life loses it; anyone who hates his life in this world will keep it for eternal life. Whoever serves me, must follow me, and my servant will be with me wherever I am. If anyone serves me, my Father will honour him.

From Chapter 9 of the Didache concerning the Eucharist:

Now concerning the Eucharist, give thanks this way. First, concerning the cup:

We thank thee, our Father, for the holy vine of David Thy servant, which You madest known to us through Jesus Thy Servant; to Thee be the glory for ever.

And concerning the broken bread:

We thank Thee, our Father, for the life and knowledge which You madest known to us through Jesus Thy Servant; to Thee be the glory for ever. Even as this broken bread was scattered over the hills, and was gathered together and became one, so let Thy Church be gathered together from the ends of the earth into Thy kingdom; for Thine is the glory and the power through Jesus Christ for ever.

But let no one eat or drink of your Eucharist, unless they have been baptized into the name of the Lord; for concerning this also the Lord has said, “Give not that which is holy to the dogs.”

Commentary from Audrey West:

Where is Jesus? He is with the Father (1:1; 14:11), and he dwells among us (1:14; 14:23). He is leading his followers to eternal life as he moves toward the hour of his death (12:32-33). Before much longer he will be “lifted up” on the cross (12:32, 34; 8:28) where he will lay down his life for his friends (15:13). Even as a grain of wheat falls to the earth in order to fulfill its true purpose, Jesus is lifted up from the earth in order to fulfill his, so that he may draw all people to himself. (12:24, 32). It is there, at the cross, that we will see his glory (17:24).