Skandapurana 5.102.16

5.102.16

yastasya nāmanirdiṣṭaṃ liṃgaṃ saṃsthāpayāmyaham ..
taṃ cāpi mūrtimaṃtaṃ ca sītayā sahitaṃ śubham ..
kṣetre medhyatame cātra tathātmānaṃ dṛṣanmayam .. 16 ..

I shall establish a liṅga designated with his name. / And [I shall establish] him in sculpted form, and the auspicious [one] accompanied by Sītā, / and likewise myself in stone in this most pure sacred field.”