פירוש על קידושין 97:8

Mar bar R. Ashi points out that in the next mishnah, there is a case of a man who claims to not have an adult daughter who and it turns out that he does. Having such a daughter seems to be some sort of a monetary advantage. According to Ulla and R. Ashi, R. Shimon should disagree—if he deceives her and in reality has a monetary advantage, she is betrothed. But he does not disagree. This indicates that just because R. Shimon does not express his disagreement, does not mean that he does not disagree. R. Shimon, according to Mar bar R. Ashi, would hold that if he deceives her to her advantage, she is betrothed, even in the case of a deception involving lineage.