Vishnupurana 4.7.10

4.7.10

tatprasāditaś ca tanmātre kṣatravaraputrotpattaye carum aparaṃ sādhayām āsa ||

In order to effect the birth of a son, Richíka prepared a dish of rice, barley, and pulse, with butter and milk, for his wife to eat; and at her request he consecrated a similar mixture for her mother, by partaking of which she should give birth to a prince of martial prowess. Leaving both dishes with his wife, after describing particularly which was intended for her, and which for her mother, the sage went forth to the forests. When the time arrived for the food to be eaten, the queen said to Satyavatí, "Daughter, all persons wish their children to be possessed of excellent qualities, and would be mortified to see them surpassed by the merits of their mother's brother. It will be desirable for you, therefore, to give me the mess your husband has set apart for you, and to eat of that intended for me; for the son which it is to procure me is destined to be the monarch of the whole world, whilst that which your dish would give you must be a Brahman, alike devoid of affluence, valour, and power." Satyavatí agreed to her mother's proposal, and they exchanged messes.