The Pesukeh De'zimra section of our morning prayer service is introduced with the blessing of Baruch She'amar. One way of viewing Baruch She'amar is to compare it to a Beracha recited over food, or to a Beracha recited over a Misva. Just as one recites "She'ha'kol" before drinking, one recites the blessing of Baruch She'amar before praising G-d through recitation of Pesukeh De'zimra. Accordingly, the Mishna Berura cites those who consider the possibility that if one spoke immediately after reciting Baruch She'amar, before proceeding to Mizmor Le'toda – the first Psalm recited in Pesukeh De'zimra – he must repeat Baruch She'amar. Just as one who spoke after reciting "She'ha'kol" before drinking must repeat the Beracha, one who spoke after Baruch She'amar before beginning Pesukeh De'zimra perhaps needs to repeat the Beracha of Baruch She'amar. Others, including the Kaf Ha'haim (Rav Yaakob Haim Sofer, Baghdad-Jerusalem, 1870-1939), disagree. The Kaf Ha'haim writes that Baruch She'amar – a blessing that, as tradition teaches, was written on a piece of paper that fell from the heavens – is part of Pesukeh De'zimra, and not its introductory blessing. Therefore, one who speaks in between Baruch She'amar and Mizmor Le'toda is not required to repeat Baruch She'amar. Hacham Ovadia Yosef concurs with this opinion, and he found earlier sources, in the writings of the Rishonim, for this ruling. It goes without saying that one must refrain from speaking and from making any sort of interruption from Baruch She'amar through the Tahanunim after the Amida. But if, for whatever reason, one spoke between Baruch She'amar and Mizmor Le'toda, he does not repeat Baruch She'amar. Summary: Although speaking is not allowed once one recites Baruch She'amar, if someone did speak after Baruch She'amar, even before he recited Mizmor Le'toda, he does not repeat Baruch She'amar.