Garudapurana 3.12.65

3.12.65

santānārthaṃ tu kṛṣṇe na śivapūjādicintanam /
rāmeṇa duḥ khayuktena liṅgasya sthāpanaṃ kṛtam //

thinking that worship of Śiva and the like was performed by Kṛṣṇa for the sake of offspring;
[thinking that] an installation of a liṅga was performed by Rāma afflicted with grief;