“For our appeal does not spring from deceit or impure motives or trickery,  4 but just as we have been approved by God to be entrusted with the message of the gospel, even so we speak, not to please mortals, but to please God who tests our hearts.  5 As you know and as God is our witness, we never came with words of flattery or with a pretext for greed;  6 nor did we seek praise from mortals, whether from you or from others, though we might have made demands as apostles of Christ. But we were gentle among you, like a nurse tenderly caring for her own children.  8 So deeply do we care for you that we are determined to share with you not only the gospel of God but also our own selves, because you have become very dear to us.”
1 Thessalonians 2:3-8

“And whatever you do, in word or deed, do everything in the name of the Lord Jesus, giving thanks to God the Father through him.” 

Colossians 3:17

“Whatever your task, put yourselves into it, as done for the Lord and not for your masters, since you know that from the Lord you will receive the inheritance as your reward; you serve the Lord Christ.”
Colossians 3:23-24.