סימן טו סעיף ט

הַקְדֻשָּׁה שֶׁבְּיוֹצֵר יֵשׁ לְהַדֵּר לְאָמְרָהּ בְּצִבּוּר, וְאִם אִי אֶפְשָׁר אוֹמְרָהּ גַּם בִּיחִידוּת. (נ"ט)

The Kedushah of Yotzeir²²Yotzer—the first of the two berachos that precede Kerias Shema. should preferably be said with the congregation. But, if this is not possible you may also say it individually.²³Generally, Kedushah can only be said communally by the congregation (see para. 1). Therefore, Rambam rules that when praying individually the Kedushah of Yotzeir should be omitted. However, Rosh and others disagree because the text here only relates to the practice of the angels while saying Kedushah: Therefore, it may be said even individually. The poskim generally agree with Rosh in this instance.

תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)