Lankavatara Sutra, Chapter 6, Section LXXXIII

As usual, I'm using the translation here.  And I'm not any kind of teacher.

What starts out as what might be a preaching of morality takes a turn.  At first:

Mahāmati the Bodhisattva-Mahāsattva said this to the Blessed One: The five immediacies are preached by the Blessed One; and what are these five, Blessed One, which being committed by a son or a daughter of a good family cause them to fall into the Avici hell?

The Blessed One replied: Then, Mahāmati, listen well and reflect, for I will tell you.

Mahāmati the Bodhisattva-Mahāsattva said; Certainly, Blessed One, and gave ear to the Blessed One.

The Blessed One said thus to him: What are the five immediacies? They are: (1) the murdering of the mother, (2) of the father, (3) of the Arhat, (4) the breaking-up of the Brotherhood, and (5) causing the body of the Tathagata to bleed from malice.

But then

Now what is meant by the mother of all beings? It is desire which is procreative, going together with joy and anger and upholding all with motherliness. Ignorance representing fatherhood brings about one's rebirth in the six villages of the sense-world. When there takes place a complete destruction of both roots, fatherhood and motherhood, it is said that mother and father are murdered. When there is a complete extermination of the subordinate group of passions such as anger, etc., which are like an enemy, a venomous rat, the murdering of the Arhat is said to take place. What is meant by the breaking-up of the Brotherhood? When there is a complete fundamental breaking-up of the combination of the Skandhas whose characteristic mark is a state of mutual dependence among dissimilarities, it is said that the Brotherhood is split up. Mahāmati, when the body of the eight Vijñānas, which erroneously recognises individuality and generality as being outside the Mind—which is seen [by the ignorant] in the form of an external world—is completely extirpated by means of faulty discriminations, that is, by means of the triple emancipation and the non-outflows, and when thus the faulty mentality of the Vijñāna-Buddha is made to bleed, it is known as an immediacy-deed. These,

Mahāmati, are the five inner immediacies, and when they are experienced by a son or a daughter of a good family, there is an immediacy-deed of realisation as regards the Dharma.

Further, Mahāmati, there are five external immediacies which I will point out to you, in order that you and other Bodhisattvas in the future may thereby be saved from ignorance. What are these five? They are those immediacies which are described in the canonical texts, and those who commit these crimes can never experience any one of these manifestations, except those Transformation [-Buddhas] who are sustained by the power [of the Tathagatas] and have already attained a realisation. The Śrāvakas of transformation, Mahāmati, who are sustained by the sustaining power either of the Bodhisattvas or Tathagatas, may see somebody else practising deeds of wickedness, and they will repeatedly make great efforts to turn him away from his wickness and faulty views, and to make him realise the non-reality of wickedness and faulty views by laying down his burden. This is the way I demonstrate facts of the transformation, the sustaining power, and the realisation. Mahāmati, there is, however, no realisation for those who are sheer offenders of the immediacies,  except when they come to the recognition of the truth that an external world is nothing but¹ the Mind itself, seeing that body, property, and abiding place are discriminations, and that the notion of an ego and its belongings are to be kept away; or, when they are released from the fault of self-discrimination by encountering a good friend at some time or other, or at any time, and being born in some other path of existence. So it is said:

 Desire is said to be the mother and ignorance the father; the Vijñāna which recognises an objective world is [compared to] the Buddha.

 The secondary group of passions is the Arhat, the amassing of the five Skandhas the Brotherhood; as these are to be destroyed immediately they are known as immediacy-deeds.