Talmud for Pesachim 206:8
א"ל אנא כהא סבירא לי דאמר ר"א אמר רבי אושעיא הפוחת לא יפחות מג' והמוסיף לא יוסיף על ז' אמר ליה
'My servant has acted of his own accord,' replied he.' Had he not heard it thus from you,'<span class="x" onmousemove="('comment',' 'The Master'.');"><sup>14</sup></span> he retorted, 'he would not have done it.' Said he to him: 'Do you then not hold, [To employ] a torch for habdalah is the best way of performing the precept? ' Then he commenced [habdalah] and recited: 'He who makes a distinction between holy and non-holy, between light and darkness, between Israel and the nations, between the seventh day and the six working days.' Said he to him: 'Why do you need all this? Surely Rab Judah said in Rab's name: "He who makes a distinction between holy and non-holy," was the formula of habdalah as recited by R'Judah ha-Nasi? ' 'I hold with the following,' answered he.' For R'Eleazar said in R'Oshaia's name: He who would recite but few [distinctions] must recite not less than three; while he who would add, must not add beyond seven.<span class="x" onmousemove="('comment',' I.e., not less than three points of distinction and not more than seven must be recited in the habdalah.');"><sup>15</sup></span> Said he to him: