Devibhagavatapurana 1.5.76

1.5.76

tayā jñātaṃ harirnūnaṃ kathaṃ māṃ hasati prabhuḥ |
virūpaṃ hariṇā dṛṣṭaṃ mukhaṃ me kena hetunā ||

At this Laksmî Devî came to understand that “He has seen surely something ugly in my face and therefore He laughed; otherwise why my Husband would laugh at seeing me. But what reason can there be as to see ugliness in my face after so long a time. And why shall He laugh without seeing something ugly, without any cause. Or it may be, He has made some other beautiful woman as my co-wife”. Thus arguing variously in her mind, Mahâ Laksmî gradually got angry and Tamo guna slowly possessed Her. Then, by turn of Fate, in order that god’s work might be completed, very fierce Tamas Sakti entered into Her body. She got very angry and slowly said:-- “Let Thy head fall off”. Thus, owing to feminine nature and the destiny of Bhagvan, Laksmî cursed without any thought of good or bad, causing Her own suffering. By the Tâmasî S’akti possessing Her, she thought that a co-wife would be more painful than Her widowhood and thus She cursed Him.