One verse

Srimad Bhagavatam 7.2.11

7.2.11

विष्णुर्द्विजक्रियामूलो यज्ञो धर्ममय: पुमान् । देवर्षिपितृभूतानां धर्मस्य च परायणम् ॥ ११ ॥

visnur dvija-kriya-mulo yajno dharmamayah puman devarsi-pitr-bhutanam dharmasya ca parayanam

visnuh
Lord Visnu, the Supreme Personality of Godhead
dvija
of the brahmanas and ksatriyas
kriya-mulah
whose root is the performance of yajna and the ritualistic ceremonies mentioned in the Vedas
yajnah
personified yajna (Lord Visnu, who is known as the yajna-purusa)
dharma-mayah
full of religious principles
puman
the Supreme Person
deva-rsi
of the demigods and great rsis like Vyasadeva and Narada
pitr
of the forefathers
bhutanam
and of all other living entities
dharmasya
of the religious principles
ca
also
parayanam
the shelter

The basic principle of brahminical culture is to satisfy Lord Visnu, the personification of sacrificial and ritualistic ceremonies. Lord Visnu is the personified reservoir of all religious principles, and He is the shelter of all the demigods, the great pitas, and the people in general. When the brahmanas are killed, no one will exist to encourage the ksatriyas to perform yajnas, and thus the demigods, not being appeased by yajna, will automatically die.