Shiva Purana

siva.sh/siva-purana/rudra-samhita/180/36

ऊर्द्ध्वं गतिः पुत्रवतां निरुक्ता मनीषिभिर्धर्मभृतां वरिष्ठैः ।। सर्वाणि भूतानि तदर्थमेवमतः प्रवर्तेत पशून् स्वतेजसः ।। ३६ ।।

sanskrit

An abode in heaven is enjoined only for those who have sons as mentioned by the learned and the virtuous. All living beings are active in that respect.

english translation

UrddhvaM gatiH putravatAM niruktA manISibhirdharmabhRtAM variSThaiH || sarvANi bhUtAni tadarthamevamataH pravarteta pazUn svatejasaH || 36 ||

hk transliteration by Sanscript