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A pastor at a Simi Valley church made a perplexing discovery while shopping at a local Costco on Friday.

Caleb Kaltenbach, the pastor of Discovery Church, was looking for a gift for his wife when he saw Bibles labelled as “Fiction.”

So, he took a picture and tweeted it to his congregation with the caption, “Costco has Bibles for sale under the genre of fiction…hmmmm.”

“I was completely offended. I believe the Bible is real and it shouldn’t be marked fiction,” church member Shellie Dungan said.

Costco issued an apology on Wednesday.

“Costco’s distributor mislabeled a small percentage of the Bibles, however we take responsibility and should have caught the mistake. We are correcting this with them for future distribution,” Costco said in a statement. “In addition, we are immediately relabeling all mislabeled Bibles. We greatly apologize for this error.”

KTLA’s Kimberly Cheng contributed to this report.