In Malachi chapter 1, God questioned the Israelites' sacrifices brought to the temple. He wanted to show them His faithfulness and love as His chosen nation. God wants us to bring the very best offering to Him, not what's leftover. At this present time, we don't bring sacrifices to a temple, but we bring tithe, offering, and our services to the church. We aren't to bring our last penny or our last amount of energy, but our best. Also, this sacrifice needs to bring honor to God, not for others to see, but as a service that would glorify Him, not ourselves. Remember, the joy and fulfillment that comes from offering our best to God is immeasurable. The sacrifice we bring to God is the sacrifice that ought to costs us the most, for He is our heavenly Father who gave His One and Only Son to die for us as the ultimate sacrifice for our sins. I encourage you to do your best at work and while serving at church, and to bring the best offering when it's time to collect an offering for Him.