Changing the Text of the Blessing “Sim Shalom”

Hello, Rabbi. A person prayed Minchah and, in the blessing of peace, said the wording “Shalom rav al Yisrael amcha tasim” (“Grant abundant peace upon Israel Your people”) instead of “Sim shalom tovah uverachah” (“Grant peace, goodness and blessing”) — has he fulfilled his obligation? And what is the source for the change in wording: why does the shorter text appear in siddurim for Ma’ariv, whereas at Shacharit and Minchah the longer text is used?

Shalom uverachah 

If one changed from the wording appropriate for that particular prayer: if he remembered before concluding the blessing, he should say the blessing again properly. If he remembered after he had concluded it, he has fulfilled his obligation and should not repeat it again. 

The reason for the change in the text of the blessing of Sim Shalom is that Shacharit is a time of Torah reading, and therefore we mention “You gave us a Torah of life,” etc. At Minchah and Ma’ariv there is no Torah reading, and therefore the shorter wording is recited. 

At Minchah on Shabbat or on fast days — when the Torah is read at Minchah — the longer text of “Sim Shalom” is recited, for the reason stated above. 

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