Looking For A Marriage Record

Wow so many informations here !
So Efim and Mikhail's father is Vasily Yakovlevitch Nechaev, a priest from Murikovo ? what a pious family. I now understand that the Russian army took the youngest Nechaev, otherwise Grigory would have been a priest too.

Thanks again for all the time you give

FuranNietchaieff

As for further research, theoretically we should have studied the clergy census the 4th census (1787) of Velmezh, Gzhatsky uyezd, to see from where he was commissioned.
It belonged to Smolensk governorate, but Pereyslavl eparchy.
I've reviewed Smolensk archive's indexes for Smolenskaya kazennaya palata and Smolenskaya dukhovnaya konsistoriya. There's no 4th census for that village, let alone for the clergy (they went seperately). The Smolensk consistory doesn't have any documents for the period from that village.
I don't know if there's anything at NIAB (Belarus), but fonds 136, Minsk consistory, doesn't seem to have anything.
I don't know if there's anything on the Pereyaslavl eparchy in other archives.
So, I don't know what can be suggested for further research.
Theoretically the Nechaevs should be from Moscow.
What area of Moscow? Were they burghers or clergy?
It's RGADA. There are some censuses from Moscow areas in the fonds # 350. Normally, RGADA has censuses: the 1st (1719-27), 2nd (1744-48) and 3rd (1760-s).
Maybe there are some more church fonds at the Moscow city archive (ЦГА Москвы), that are not digitized, with documents of the 18th century.
I'm not an expert in that area.

FuranNietchaieff написал:

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They were assumed to be brothers because Efim had been indicated as a priest for Mikhail Nechaev's children

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No, he was their godfather, not the priest performing the baptism. And it's not Efim's church. So, 90% their must be brothers, since the same last name.
In case of the shortage of direct indications, all these godparents and witnesses on weddings are of great help. They do work, because very often these people were either blood relatives or in-laws. The godparents must be the closest circle.

Alexander Nechaev had a son named Viktor
Here's the death record of Viktor's wife, Nadezhda Maximovna (b. circa 1844). Burried in the village of Tsaritsyno, Moscow uyezd.

ЦГА Москвы ф 203 оп 780 д 1357 (file 297)
Метрическая книга Московского уезда села Царицина церкви Божьей Матери, именуемой Живоносный источник за 1886 г
June 14th, 1886
# 19
лл 290об-291
"Умершего протоиерея московской Софийской на Набережной церкви Александра Ефимовича Нечаева, сына Виктора Александровича Нечаева, жена Надежда Максимова, 42, от чахотки"

Here's another copy of the metrical book

Here's the marriage inspection (брачный обыск) on the daughter of Efim Vasilyevich Nechaev, Anna. 1838.

The wedding was to take place in the St Paraspeva church in the Oxotny Ryad, Nikitsky sorok, Moscow
The groom: the son of the deacon of the church of the village of Gribanovo, Volokolamsky uyezd, Ivan Ivanovich Krotkov, Matvey Ivanovich Krotkov, who wa sthen a student at the Moscow seminary. Age - 22
The groom was to enter the St Paraskeva church as a deacon. He resided in the house of Mr Karneev, at the parish of the Ascention of Christ near the Nikitsky gates.

The bride: the daughter of the priest of the St Theodorre the Studite church, Efim Vasilievich Nechaev, Anna Efimovna, resided in her father's house at the parish of his church near the Nikitsky gates. Age - 17
Underneath are the signatures, and Anna signed herself! (which was very rare for women).
Also, among the signed there's the brother of the groom, Alexey Ivanovich Krotkov, the inspector of the " Don schools" (Инспектор Донских училищ)
The witnesses for the bride were her father and brother Alexander.