Kamasutra 4.2.8

4.2.8

bahvībhis tv adhivinnā avyavahitayā saṃsṛjyeta//

When there are many other wives besides herself, the elder wife should associate with the one who is immediately next to her in rank and age, and should instigate the wife who has recently enjoyed her husband’s favor to quarrel with the present favorite. After this she should sympathize with the former, and having collected all the other wives together, should get them to denounce the favorite as a scheming and wicked woman, without however committing herself in any way. If the favorite wife happens to quarrel with the husband, then the elder wife should take her part and give her false encouragement, and thus cause the quarrel to be increased. If there be only a little quarrel between the two, the elder wife should do all she can to work it up into a large quarrel. But if after all this she finds that her husband still continues to love his favorite wife, she should then change her tactics, and endeavor to bring about a conciliation between them, so as to avoid her husband’s displeasure.