Mark 12.28-34 is the RCL designated text for the 23rd Sunday after Pentecost Year B which occurs on 31 October 2021. (Many Lutheran / Protestant congregations will probably celebrate Reformation Sunday on this day. I'll have a separate post for John 8.31-36.)
On Monday of Holy Week, Jesus had driven the merchants out of the Temple Mount, but he returned on Tuesday to continue his teaching. Jesus is confronted with questions by various Jewish authorities to trick or entrap him, but he replies and refutes each challenge successfully. And that brings us to the last question posed to him here in Mark 12.28-34.
Here are a collection of translations, including my own, and my notes on translating this passage.