This Samadhi, when not followed by extreme non-attachment becomes the cause of the re-manifestation of the gods and of those that become merged in nature

Verse 19

भवप्रत्ययो विदेहप्रकृतिलयानम् ॥१९॥

bhava-pratyayo videha-prakr‌ti-layānam ॥19॥

bhava = being, becoming

pratyayah = perception, thought, intention, representation

videha = bodiless

prakriti = nature

layaanaam = clasped, merged

in 1.19 he patanjali says Bhava pratyayo videha prakriti layaanaam

These latent impressions or Samskaras are bodyless in nature and are bound together. 

Here he's indicating that our sadhana and spiritual progress is not gonna go waste after death, its carried by samskaras and they dont die with the body, they are carried on in our next janmas

.This Samadhi, when not followed by extreme non-attachment becomes the cause of the re-manifestation of the gods and of those that become merged in nature

PATANJALI YOGA SUTRAS