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I've heard a man shouldn't wear anything on his left arm (as a bracelet, watch, etc) while having tefillin tied on. If this is true, would it be completely wrong to wear a red string on the left arm (where it should be) if one puts on tefillin daily?

According to Kabbalah, the red string should be on the left receiving side.

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Shmuel, welcome to the site and thank you for bringing your interesting questions! Can you clarify what you mean by the left arm being the place a red string should be (if I am parsing that correctly)? – Double AA Aug 2 '12 at 23:49
Can you add a source for wearing a red string, and that it should be on the left? – Yirmeyahu Aug 2 '12 at 23:58
I'm still not sure what red string your talking about, but if you could source your last statement that would increase the value of the question and perhaps make it easier to answer. – Double AA Aug 2 '12 at 23:58
Finally found it! Possible duplicate judaism.stackexchange.com/q/17170/759 – Double AA Aug 3 '12 at 0:07
@DoubleAA Your answer there would make for a good answer here IMO. – msh210 Aug 3 '12 at 5:28

Hakham Ovadya Yosef z"l rules explicitly in Yabia `Omer (Orah Hayyim 2:2) - citing the view of the Rashba - that the concept of a hassissah only applies to the bayith and the upper arm, not to the straps, and especially not on the wrist. The question there is regarding a wristwatch, but it would by extension apply to anything being worn on the wrist.

[As for the red string itself, the concept is completely without source or basis in Hazal or even the kabbalah. It was something started in a couple of families not too long ago and has caught on as a money-making superstition. Check it out for yourself.]

Hope this helps. Kol tuv.

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I don't see why one couldn't wrap the strap of the t'filin under the string (unless it's very tight). That's what I've done with hospital identification bands. Then, to answer your question, "would it be completely wrong to wear a red string on the left arm… if one puts on tefillin daily?", no, I don't see why it would.

But consult your rabbi if this is a practical question for you, rather than relying on what you read on this site.

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The Mishnah Brurah (27:16) says to not put anything between the tefilin straps and the skin. This implies that when not wearing the tefillin straps, you are allowed to put something there.

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Isn't the question about putting tefillin on while the string is there? – Double AA Aug 3 '12 at 3:24
@DoubleAA That was my first sentence – b a Aug 3 '12 at 5:16
Then what is the point of the second sentence? He's asking about wearing it permanently. – Double AA Aug 3 '12 at 5:20
His question: "If this is true, would it be completely wrong to wear a red string on the left arm (where it should be) if one puts on tefillin daily?" He wrote "if one puts on tefillin daily," not "while he is wearing tefillin," so I was in doubt as to which he meant. I tried to make my answer cover both possibilities. – b a Aug 3 '12 at 5:21

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