Garudapurana 3.24.13

3.24.13

tatsaṃginaḥ sāttvikāḥ kecideva hyato bhaktā durlabhā vai kalau ca /
ye dṛśyante bhaktavatte na bhaktāḥ śiśrodarayorbharaṇe caiva saktāḥ //

Only a few of those associated with them possess sattva; therefore, true devotees are very rare in Kaliyuga. / Those who appear to be devotees are not devotees; they are merely intent on filling their genitals and bellies.