Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_20891 ( "Archbishop" text, "Born" text, "Ordained Priest" text, "Ordained Bishop" text, "Appointed Archbishop" text, "Vacated throne" text, "Died" text )

### Question ###
What date was the person ordained as a priest in December 1838 ordained as a bishop?

### Accurate SQL ###

SELECT "Ordained Bishop" FROM table_20891 WHERE "Ordained Priest" = 'December 1838'