John Calvin on Luke 22:29-30

29. And I appoint to you the kingdom. Here he makes them not only judges, but kings; for he shares with them the kingdom which he received from the Father There is an emphasis in the word appoint, that they may not, by warmth and vehemence of desire, hasten too eagerly to possess the kingdom of which he alone has the lawful right to dispose. By his own example, also, he exhorts them to patience; for, though he was ordained by the Father to be a King, yet he was not immediately raised to his glory, but even emptied Himself, (Philippians 2:7,) and by the ignominy of the cross obtained kingly honor. To eat and drink at his table is put metaphorically for being made partakers of the same glory.