Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_16677887_2 (opponent VARCHAR, bills_first_downs VARCHAR)
### Question:
What team were the bills playing where their first down was 23?
### Answer:
SELECT opponent FROM table_16677887_2 WHERE bills_first_downs = 23