The Ben Ish Hai (Rav Yosef Haim of Baghdad, 1833-1909) emphasizes the importance of reciting the verse of "Shema Yisrael," and "Baruch Shem Kebod Malchuto Le’olam Va’ed," during the Korbanot section of the prayer service (listen to audio recording for precise citation). These verses appear in the Siddur during the Korbanot section, just before the verses of the "Tamid." One does not have to recite the rest of Shema – "Ve’ahabta" and the other paragraphs – during the Korbanot section. At this point in the prayer service, one recites only the verses of "Shema Yisrael" and "Baruch Shem."
The Ben Ish Hai writes that when reciting Shema during Korbanot, one must concentrate intently on the meaning of the words, just as it required during the main Shema recitation, in the section of "Yoser Or." The words "Shema Yisrael" mean "Listen, Israel," or "Perceive, Israel." The divine Name of "Havaya" refers to God’s existing in the past, present and future, and that He is the master over everything. "Elokenu" means that He is all-powerful and exerts complete control over the earth. When reciting the final two words, "Hashem Ehad," one must again have in mind the meaning of "Havaya," and that the word "Ehad" expresses the oneness of God (the Alef in "Ehad"), God’s dominion over the earth and the seven heavens (the Het in "Ehad"), and His dominion over the four corners of the earth (the Dalet in "Ehad"). When pronouncing the Dalet in "Ehad," one should also have in mind that he is prepared to give his life for God, and to subject himself to the four forms of capital punishment (stoning, burning, decapitation and strangulation).
The Ben Ish Hai emphasizes that there is a Rabbinic obligation to recite Shema at this point in the prayer. The Sages instituted that one should recite Shema four times each day – during Korbanot, the main Shema recitation during "Yoser Or," the Shema recitation at Arbit, and the bedtime Shema. The Ben Ish Hai adds that one should have in mind when reciting Shema during Korbanot to fulfill this Rabbinic obligation. Furthermore, he adds, this recitation is critically important in enabling one’s prayers to have their desired effect. The power of the primary Shema recitation, he writes, depends upon the recitation of Shema during Korbanot.
It occasionally happens that one skips the Korbanot section because he arrives in the synagogue late. In such a case, one must ensure to at least recite the verses of "Shema Yisrael" and "Baruch Shem" with concentration, as discussed.
Summary: One must ensure to recite "Shema Yisrael" and "Baruch Shem" during the Korbanot section of the morning prayer service, as printed in the Siddurim, with proper concentration. One should have in mind while reciting these verses to fulfill the Misva enacted by the Sages to recite Shema at this point in the service.
