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Tehilim 134 says "to lift the hands of the servents of the Lord." Why during prayer must everyone raise their hands? I mean, prayer can also done by folding hands, but at night why we should raise our hands during prayer?

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My question is about prayer. How can my prayer work if God knows what’s good for me and has plans for me anyway? If I nag and kvetch to God about what I want does it really change anything?

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In V-Shamru, the words "the children of Israel" are written 2 different ways: 1st: בְנֵי יִשְׂרָאֵל 2nd: בְּנֵי יִשְׂרָאֵל Why is the first with a Vav and the second with a Bet? Should each be pronounced accordingly? I have always used the B sound for both.

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After counting the omer each night, there is a short prayer HaRachaman Hu Yachazir Lanu Avodat Beit HaMikdash Limkomo Bimheira Be'yameinu. Amein Selah Amen is the usual ending of a prayer. Why is the additional word selah necessary? What is the meaning of "Amein Selah"? What do the two words together mean versus each word separately? Thanks.

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Questions about pronunciation and meaning of some Hebrew words. Thanks for your help. Hebrew word Meaning Pronunciation שַׁבָּת Sabbath Sha-Bat שָׁבַת Sabbath Sha-Vat Why V sound vs B sound? מִמְקוֹמוֹ from its place Mim-komo Never heard as Mi'me-komo לִמְקוֹמָה to its place Lim-komo Yet for this word, some say Li'me-komo

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Rabbi, when I prayer in front of the Shabbos lights on Friday evening, I pray for the welfare of all my children and parents, etc. Do I mention their names using their mother's name or do I mention their father's name? Thank you.
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In a Sabbath service, is one supposed to bow when the word Baruch is recited since Berech means knee?