Nullifying is mentioned in the Quran in these verses:

[2:264] O you who believe, do not nullify your charities by inflicting reproach and insult, like one who spends his money to show off, while disbelieving in God and the Last Day. His example is like a rock covered with a thin layer of soil; as soon as heavy rain falls, it washes off the soil, leaving it a useless rock. They gain nothing from their efforts. God does not guide disbelieving people.

[9:69] Some of those before you were stronger than you, and possessed more money and children. They became preoccupied with their material possessions. Similarly, you have become preoccupied with your material possessions, just like those before you have become preoccupied. You have become totally heedless, just as they were heedless. Such are the people who nullify their works, both in this world and in the Hereafter; they are the losers.

To learn more, read the Quran in English.

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