Quoting from this page:
- But Abhiśastas shall live together in dwellings (outside the village); considering this their lawful (mode of life), they shall
sacrifice for each other, teach each other, and marry amongst each
9. If they have begot sons, let them. say to them: 'Go out from amongst us, for thus the Āryas, (throwing the guilt) upon us, will
receive you (amongst their number).'2
For the organs do not become impure together with the man.
(The truth of) that may be learned from this (parallel case); a man deficient in limbs begets a son who possesses the full number of
Hārita declares that this is wrong.
A wife is similar to the vessel which contains the curds (for the sacrifice).
For if one makes impure milk curdle (by mixing it with whey and water) in a milk-vessel and stirs it, no sacrificial rite can be
performed with (the curds produced from) that. Just so no intercourse
can be allowed with the impure seed which comes (from an Abhiśasta).
First of all these verses are talking about how Abhisastas must live. Abhisastas are the ones who have committed the sin of killing other humans.
Quoting from here:
According to Hārita, this (last-mentioned penance must) not (be performed).
For he who takes his own or another's life becomes an Abhiśasta.
He (the violator of a Guru's bed) shall perform to his last breath (the penance) prescribed by that rule (Sūtra 11). He cannot be
purified in this world. But (after death) his sin is taken away.
Now, on 18.104.22.168, the commentator (Georg Bühler) does not agree with Haradutta's translation. He comments the following:
It is impossible to agree with Haradatta's explanation of the words to
be addressed by Abhiśastas to their children. No Vedic license can
excuse the use of the second person plural instead of the third. I
propose the following: 'Go out from among us; for thus (leaving the
guilt) to us, you will be received (as) Āryas.' it is, however, not
improbable that our text is disfigured by several very old
corruptions, compare Baudhāyana II, 1, 2, 18.
Anyway, what that verse is saying is that children of Abhisastas may leave their parents and start living among Aryas where they will be accepted because the children did not inherit the sin and they are pure. This is the view of Apasthambha. But in one of the next verses it is said that Harita (another Smriti Karta) does not agree with this view point and his arguments are also given.