In plain words
When Aśvatthāmā cut the throats of the sleeping Upapāṇḍavas, the forgiveness she showed was beyond compare. Arjuna seized Aśvatthāmā, bound him, brought him and stood him before Draupadī. Instead of growing angry that he had seized and killed her sons, Draupadī fell at Aśvatthāmā's feet and spoke in this way: “Sir! You cut my sons' throats. If my husbands now cut off your head, do you not know how much your mother will suffer? What did you gain by cutting the throats of little children? Knowing that this is a great sin, how could you do this deed? My husbands are your father's disciples. So our children are your disciples. Is it not a great sin to kill disciples! No demon, even, would stoop to such wickedness. You are no demon; you are a pandit who knows all the śāstras. It is not right for one as great as you to commit such a misdeed.
All our men, as is well known, long ago the loosing and recalling of arrows and every other art of arms learned from Droṇācārya; you are Droṇa in the form of his son; in your heart, without the least touch of compassion, is it right for you to cut down the sons of his pupils?
They did not come at you in fury; they were not on the battlefield bearing arms; not the least wrong did they do you; in the pride of your strength, in the dark, these lovely ones, little children, with no skill in the work of war, fast asleep: to slay them, alas! how could your hands move to it?”
Holding the feet of Arjuna, who was ready to cut off Aśvatthāmā's head, Draupadī: “Arjuna! You have done tapas. You have studied the śāstras. But what is the use of all you have done? Though you know the śāstras, you are setting out to break them. What do the śāstras teach?
One who is afraid, one whom misery has bewildered, one who in sleep has lost himself, one who has drunk liquor in his pleasure, one who, broken, has fled, one gentle and inert, one who cries out ‘Save me!’ and pleads, and women: to kill these is not Dharma, Phalguna!