Malachi 1:8 When you offer blind animals for sacrifice, is that not wrong? When you sacrifice lame or diseased animals, is that not wrong? Try offering them to your governor! Would he be pleased with you? Would he accept you?’ says the Lord Almighty.
Back in the times when the people of Israel had to offer animals as sacrifices, typically they would have to find a sheep with no marks or anything else wrong with it to be a perfect sacrifice. Jesus became our perfect sacrifice when He offered Himself on the cross for us.
Are we then to offer Him substandard worship or respect? Are we then to keep back the best and give Him second best? Would you buy the second best for your partner if you could afford the best?
God wants us to be willing to do our best for Him at all times because He is our best friend.