Matthew 26:46 parallels Mark 14:42 almost verbatim: 'Rise, let us be going; behold, he is at hand that doth betray me.'

John 18:1 provides the location (Kidron valley, garden) where Jesus went after saying 'Rise, let us go'. Parallel account of the same transition.

John 18:2 explains why Judas knew where to find Jesus — he often met there. This adds a detail to the betrayal context.