It is necessary to pay attention to the feet when the worshiper repeats "Holy! holy! holy!" and he is to lift up his eyes toward heaven. At the instant the Kiddushah is repeated he needs only lift up his heels, and thereby his body from the earth toward heaven.... According to Tanchuma it is necessary to lift up the feet from the earth altogether, after the example of the angels, of whom it is written (Isa. vi. 2), "And with two he did fly." It is from this text that the sages have ordained that a man should fly up (as it were) when he repeats "Holy! holy! holy!" And let the chooser choose, i.e. it is optional either to lift up the heels only or to jump. Ibid. Any one who visits a synagogue may notice the observance of this practice. In the synagogues of the Chassidim, jumping is preferred to lifting up the heels. It is written (Ps. cii. 17), "He will regard the prayer of the destitute," and it is not written, "He will hear." What else can the term "regard" mean than that there is a distinction between the prayer of an individual and the prayer of a community? For when a community prays, their prayer enters before the Holy One--blessed be He!--and He is not particular to regard and criticise their works and their intentions and thoughts, but receives their prayers immediately. But when an individual prays, the Holy One--blessed be He!--regards and scrutinizes his heart, whether it be devout and whether he be a righteous man. Therefore, one should always pray with the community, and this is why the text (Ps. cvii. 17) ends with the words, "And not despise their prayer." Although there are some of the community whose prayers, on account of their evil deeds, deserve to be despised, He, nevertheless, does not despise their prayer. _Kitzur Sh'lk_, fol. 51, col. 1. A man should study less on Friday, that he may occupy himself with the preparation for the Sabbath. And accordingly we find in the Gemara that some of the great and esteemed sages occupied themselves on that day in preparing what was needed for the Sabbath. Therefore, though one may have many servants to wait upon him, it is a great merit personally to prepare for the wants of the Sabbath in order thus to honor it; and let him not think it derogatory to his own honor to honor the Sabbath thus, for it is his honor to honor the Sabbath. It is written of H'A'ree of blessed memory, that he was in the habit of sweeping away the cobwebs in his house (in honor of the Sabbath), and it is well known to the initiated what a wonderful mystery it is to abolish the unclean spirits from the house, "And this is enough for him that understands." Ibid., fol. 61, col. 1.