There were no cantatas performed in the Lutheran church in Leipzig during Lent in the time of JS Bach.
Don't despair, however, because we will listen to the only surviving cantata from Bach's Weimar years that was likely performed on the Third Sunday in Lent, 24 March 1715: BWV 54, Widerstehe doch der Sunde (Resist sin indeed). So tune in to Classical Sunrise during the 6 am hour on 7 March to hear this performed.
The only other Bach cantata that would have been performed during Lent (depending on when Easter falls) would have been a cantata for the Feast of the Annunciation of the Blessed Virgin Mary, on 25 March. And, you can expect something special on Classical Sunrise (perhaps the B minor Mass) on Bach's birthday, Sunday 21 March.