SB 4.14.42

The purity of hereditary succession is called amogha-virya. The pious seminal succession in the twice-born families of the brahmanas and ksatriyas especially, as well as in the families of vaisyas also, must be kept very pure by the observation of the purificatory processes beginning with garbhadhana-samskara, which is observed before giving birth to a child. Unless this purificatory process is strictly observed, especially by the brahmanas, the family descendants become impure, and gradually sinful activities become visible in the family. Maharaja Ahga was very pure because of the purification of semina in the family of Maharaja Dhruva. However, his semina became contaminated in association with his wife, Sunitha, who happened to be the daughter of death personified. Because of this polluted semina, King Vena was produced. This was a catastrophe in the family of Dhruva Maharaja. All the saintly persons and sages considered this point, and they decided to take action in this matter, as described in the following verses.