Speak to the Israelite people, and say to them:
When any of you presents an offering of cattle to GOD: You shall choose your offering from the herd or from the flock.

When a person presents an offering of grain to GOD: The offering shall be of choice flour; [the offerer] shall pour oil upon it, lay frankincense on it,

ונפש כי תקריב AND WHEN A PERSON (or “A SOUL”) WILL OFFER — Nowhere is the word נפש employed in connection with free-will offerings except in connection with the meal-offering. For who is it that usually brings a meal-offering? The poor man! The Holy One, blessed be He, says, as it were, I will regard it for him as though he brought his very soul (נפש) as an offering (Menachot 104b).

מנחה, another word for “gift.”

R. Yohanan said: When you show the whites of your teeth to a person (by smiling at them) it’s even better than giving them milk to drink.
This is based on the words (in the blessing to Yehudah in our parashah): “u-le-ven shinayim mei-halav” (Bereishit 49:12). Instead of reading it le-ven shinayim mei-halav (which means, “his teeth are white from drinking milk”), change the vowels a little and read it: libbun shinayim mei-halav (which means, “white teeth—smiling—is better than milk”).

AND RECEIVE ALL MEN WITH A CHEERFUL COUNTENANCE. What does this mean? It teaches that if a man presents the most precious gifts in the world to his fellow but gives them with a sullen countenance, Scripture regards him as having presented him with nothing. On the other hand, he who receives his fellow with a cheerful countenance, though he give him nothing, Scripture accounts it to him as though he had presented him with the most precious gifts in the world.