Halakhah for Niddah 86:68
<big><strong>מתני׳</strong></big> תנוקת בת יום אחד מטמאה בנדה בת י' ימים מטמאה בזיבה
as a dead creeping thing conveys uncleanness only when it is of the bulk of a lentil so does semen convey uncleanness only when it is of the bulk of a lentil; while according to him who maintained that a deduction is limited by its original basis<span class="x" onmousemove="('comment',' V. p. 301, n. 15. ');"><sup>55</sup></span>
Sefer HaChinukh
From the laws of the commandment is that which they, may their memory be blessed, said (Niddah 43b) that the measure for one who touches [it] is like [the size of] a lentil, and for one who [experiences] the emission is with the smallest amount. And it is one, whether he [experiences] the emission accidentally or volitionally, he is impure. And the seed of a young child does not render impure. And red seed does not render impure, but rather [only] white. And any seed that a man does not feel - not at the beginning and not at the end - is not impure. And one who has [improper] thoughts at night, and saw in a dream that he had sexual relations and got up and found his flesh [to be] warm, is impure - even though he did not [knowingly experience] semen. And the rest of its details are elucidated in Tractate Zavim (see Mishneh Torah, Laws of Offerings for Those with Incomplete Atonement 1).
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