For attractive lips, speak words of kindness. For lovely eyes, seek out the good in people. For a slim figure, share your food with the hungry. For beautiful hair, let a child run his or her fingers through it once a day. For poise, walk with the knowledge that you never walk alone." Audrey Hepburn.
In my experience the best words are "I'm so sorry and I'm here for you if you need me" and even better than words are actions. We had people bring us food and send us restaurant gift cards, which was so helpful because we couldn't think straight enough to worry about cooking.