1 Corinthians 15:33-34, 58

Be not deceived: Evil companionships corrupt good morals. Awake to soberness righteously, and sin not; for some have no knowledge of God: I speak this to move you to shame.

Wherefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labor is not vain in the Lord.