Canto 1 - Boyhood
Bāla-kāṇḍa
Chapter 37: The History of Skanda
Text 1.37.34

भक्तश्च यः कार्तिकेये काकुत्स्थ भुवि मानवः।
आयुष्मान्पुत्रपौत्रैश्च स्कन्दसालोक्यतां व्रजेत्॥

bhaktaś ca yaḥ kārtikeye kākutstha bhuvi mānavaḥ
āyuṣmān
putra-pautraiś ca skanda-sālokyatāṁ vrajet

bhaktaḥ ca yaḥ = who becomes a devotee; kārtikeye = of Kārtikeya; kākutstha = Kakutstha; bhuvi = on earth; mānavaḥ = that man; āyuṣmān = becomes long lived; putra-pautraiḥ ca = with his sons and grandsons [in this life]; skanda-sālokyatām = [and his next life] the planet of Skanda; vrajet = attains.

O Kākutstha, that man who becomes a devotee of Kārtikeya become long-lived with his sons and grandsons [in this life and in his next life] attains the planet of Skanda.

Incidentally, the sage describes the result of devotion to Skanda.