According to the Abarbanel, it is necessary to explain why the Torah emphasized the importance of verbally articulating the intent behind fulfilling these commandments more than other commandments. In this context, the Maharsha raised a difficulty (Pesachim 116b): "Anyone who did not say these three things, etc." We do not find with other commandments that one needs to articulate the reason behind them, as it is sufficient to bless them for the mitzvah. The answer given is: "However, the reason for this matter is explicitly stated in the beginning of the first chapter of Zevachim, that all sacrifices that were offered not for their intended purpose are valid, except for the Passover offering and the sin offering, which are invalid if not offered for their intended purpose. The reason for this matter is explicitly stated there, that due to their deficiency and distance from holiness, they require more closeness to holiness, which means offering them for their intended purpose. Therefore, Rabban Gamliel said that even the eating of leftovers should be explicitly for the sake of bringing closer to holiness." The interpretation of his words is that a person needs to focus on fulfilling these commandments by articulating with his mouth 'for the sake of the mitzvah' more than other commandments, as it is enough to fulfill the other commandments with the intention to fulfill them or in the act of fulfilling the commandment itself.