Paithinas smriti famously known as Paithinasi is the dharma shastra belonging to Atharva veda . Yet Angirasa smriti , Aushnas smriti might also be considered as smriti texts belonging to Atharva veda.But after studying them critically I think there is no direct relation of these two with Bramha veda.But in case of paithinasi ,it possesses direct relationship, it quotes mantras from samhita ( Both paipalada and Shaunak ) of Atharvan veda .
For example in Bramhachari khanda it indicates SamA Sinchatu…… [ A.S-7.33.1] mantra , which is in both Atharvan samhitas .Even Kaushika sutra implies same mantra for paryukshan
before and after samidhaadhanm.
Even in Shraddha khanda it gives same vidhi as of Atharvan parishishtha for shraddha .
The mantra Yad annadha…..
also belongs to Atharvan veda.
( The authorship of some atharvan parishishtha is also attributed to Paithinasa Acharya .)
yA dIvyA …. Mantra also belongs to Atharvan veda.
These are some examples.
According to my information lost paithinasi had 7 khandas and shlokas about 1000-1500. ( in anushtup meter mostly )
Some part ( partial fragments) of three khandas are known out of seven because we get their fragments in dharmashastra- nibhandhas of medieval period .( Krityakalpataru , Dharmasindhu , HemAdri also known as Chaturvarga cintamani , Viramitrodya , Smriti chandrika ). I have traced names of remaining khandas by the help of Karma-Panjika , Karma- Sammuchya, paipalad grihya paddhati these are paddhati grantas of paipalada atharva vedins used till date by Orrisan bramhans ( Utkal bramhans ).Karma panjika and Karma sammuchya also quotes sutras from Paithinasi Grihya sutra which is lost grihya sutra of Paipalada shakha. The Karmapañjikā (KP), a text whose existence first taken note of by Bhattacharyya , has been used here and there, but has nowhere been discussed, by Bhattacharya in his edition of paipplada samhita ( Utkal patha or Orrisan patha ) PS 1-15. The KP claims to follow an otherwise lost Sūtra of paithinasa , and at several points quotes directly from this Sūtra. I have not yet been able to find any evidence about the author of the KP, Śrīdhara. Paithīnasi’s work referred to in the KP may have been a counterpart of the Kauśikasūtra of the Śaunaka Śākhā, i.e. a Grihyasūtra of the Paippalāda Śākhā, or an Atharvavedic Dharmasūtra (of the Paippalāda Śākhā). Confirmation of these interesting possibilities requires further intensive study.For example in vedavrata section of Karmapañjikā posses quotes from paithinasi.
“agnyādheyaṃ svadhāṃ caiva yajñadānavratāni ca | vedavrataṃ vṣotsargaṃ cūḍākaraṇamekhalā | māṅgalyam tatrādau śiṣyaḥ abhiṣekaṃ ca malamāse vivarjayed iti ǁ” This is a single example of fragment from Karmapañjikā . Karmapañjikā contains lots of fragments from samanya dharma & Paribhasha section of paithinasi .
A list of names of seven khandas is given below .( It is not critical ,but based on primary information, I am working on this treatise )
1) ParibhAshA Khanda
2) SAmAnya dharma khanda
3) BramhachArI khanda
4) Grahasta khanda
5) ShrAddha khanda
6) AdhikAra khanda
(dAyabhAga khanda )
7) Prayachhita khanda
Authorship of these treaties is attributed to” MaUslI putrA – PaithInasa “.Paithinasa acharya is described as An authority ( PurvA AcharyA ) in Kaushika sutra. I’m trying to collect all fragments of paithinasi and will publish this fragments under a title ” Paithinasi – revived again ”