I Thessalonians 2:4
But as we were allowed of God to be put in trust with the gospel, even so we speak; not as pleasing men, but God, which trieth our hearts.
This Liberated Wailing Wall song discusses the necessity of those who have been entrusted with the Gospel to focus on pleasing God and not men:
I Thessalonians 2:13 (I Thessalonians 2:13)
Popularized by Mark Altrogge