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THE VOICE OF JACOB, because he speaks in an entreating strain —“Arise I pray thee.” Esau, however, spoke in a harsh strain (v. 31) “Let my father arise” (Midrash Tanchuma, Toldot 11).

הקול קול יעקב, seeing that Esau and Yaakov were twins, their voices were similar to one another. This made it easy for Yitzchok to err as to who was in front of him if he were to rely only on his sense of hearing. Having first established that unlike Yaakov who was smooth skinned, the son in front of him was hairy, Yitzchok was now faced with a dilemma whether to trust his sense of hearing or his sense of touch.

והידים ידי עשו. There can be no question that the skins had been prepared in such a fashion that the hair on them were just like the hair on human skin, for in its natural state the hair on goatskin is considerably different from that on a human skin. What the Torah testifies to then is that Yaakov’s hands now were just as hairy as the hands of Esau. It is quite possible that not only Yitzchok’s eyesight had deteriorated to the point where it did not serve him to identify objects with any degree of certainty, but that also his sense of touch had become weakened as a source of identifying objects he touched. Samuel II 19,36-37 would support this where Barzilai lists a number of his faculties which suffered weakness as a result of old age.

ויגש...והידים, he did not examine the skin on the (supposed) smooth part of his throat. He relied solely on checking his arms.

הקול קול יעקב, “the voice sounds like the voice of Yaakov, etc.” Rashi writes that Yitzchok meant it was not the habit of Esau to mention the name of the Lord in his conversation, something that made Yitzchok wonder who stood before him. Nachmanides writes that it his hard to imagine that Yitzchok viewed Esau as a wicked person and yet he was about to give him the blessing of Avraham. Possibly, he thought that seeing that Esau was a man of the field, he deliberately refrained from mentioning the name of the Lord, as he might utter it in a location where it would not be appropriate to do so. In other words, Yitzchok considered the very fact that Esau did not usually mention the name of the Lord as a point in his favour. From the point of view of the plain text, we are being told that the voices of the two sons were quite different from one another, and Yitzchok could not fail to notice this.

הקול קול יעקב, “the voice is the voice of Yaakov.” We are taught in Bereshit Rabbah 65,21 that “Yaakov (the Jewish people) controls (employs as his weapon) only his voice (his weapon is prayer).” The Midrash bases this on our verse here. The Midrash continues that by the same token Esau’s control extends only over his hands (he relies only on the sword), as Yitzchak had added: “and the hands are the hands of Esau.” Similarly, we have a verse in Psalms 20,8 אלה ברכב ואלה בסוסים ואנחנו בשם אלוקינו נזכיר, “They (call) on chariots, they (call) on horses, but we call on the name of the Lord our G’d.” Moses referred to this in Numbers 20,16 when he reminded the king of Edom of the experiences of the Jewish people in Egypt. He said: “We cried out to the Lord and He heard our voice.”
Rabbi Abba bar Kahane said that the most prominent Gentile philosophers such as Bileam son of Beor and Avnimus the Ardi were asked how one could overcome the power of the Jewish people. They were told to go to the synagogues and check on whether the young children were busily engaged studying Torah and praising the Lord. If so, they were told, there was no chance in the world to overcome these people, as their principal weapon was their voice appealing to G’d to come to their support.

He spoke gently and entreatingly... [Rashi knows this] because if it follows its simple meaning, i.e., Yitzchok recognized his voice, then Yitzchok immediately should have commented when hearing him say, “It is I, Eisov your first-born.” Furthermore, when Yaakov said to his mother, “Suppose my father touches me” (v. 12), why was he not worried [also] about being recognized by voice? Perforce, their voices were similar, and this is why Rashi explains “the voice of Yaakov” as speaking entreatingly.

הקול קול יעקב והידים ידי עשו, “the sound of the voice is that of Yaakov, whereas the feel of his hands is like that of the hands of Esau.” According to Midrash Rabbah, 69,20 the deeper meaning of these words is that Yitzchok knew that Esau could cause harm only with his hands, when near the victim, whereas Yaakov, whose weapon was prayer, could use that weapon over vast distances.

.הקול קול יעקב, “the voice is distinctly the voice of Yaakov;” Yitzchok was not willing to base his judgment on the voice alone, as people are apt to disguise their voices on many occasions, both voluntarily and involuntarily. However he did not let this disturb him as the evidence of Yaakov’s arms and hands which were hairy were a much better indication that Esau indeed was standing in front of him. This was why he proceeded to give him a blessing that he had intended to give Esau.

Spoke stridently... Although Yitzchok considered Eisov completely righteous, this does not show Eisov’s wickedness. There are many people who speak stridently although they are good people.