This chorale prelude by Bach offers a contemplative setting of a familiar hymn, characterized by its flowing melodic lines and rich harmony. It's a piece that invites introspection and expressive playing.
The main challenge is achieving a beautiful, singing tone (cantabile) and employing sensitive rubato to shape the melodic phrases.
Als Jesus Christus in der Nacht (BWV 265) is rated Henle level 3 of 9 — late beginner repertoire, roughly ABRSM grades 4–5. In the RCM system it corresponds to about level 3.
You should be comfortable at Henle level 3 — meaning you can already play level 2–3 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Als Jesus Christus in der Nacht (BWV 265) lasts about 2 minutes.
Als Jesus Christus in der Nacht (BWV 265) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.