The Bible says in James 3:8, "But no human being can tame the tongue. It is a restless evil, full of deadly poison." The tongue can be the most wicked weapon on earth, so use it wisely and speak your words with caution. As Christians, we shouldn't fill our lives with deceit. We should always strive to leave honest, open lives that are full of trust and love. But, since we are all human, sometimes it is hard to avoid lying.
White lies and small omissions are still lies - we should always remember that. The option to lie should not be a in a Christian's life; we should always think of the truth first. We are not made perfect and we are tainted by original Sin. But no matter how imperfect we are, we should always strive to be good people - and this means not lying.
Please read these Bible verses on lying if you need help with telling lies. Sometimes it is extremely difficult to tell the truth, but God can give you the courage to do so.