الْغِنَاءُ يُنْبِتُ النِّفَاقَ فِي الْقَلْبِ كَمَا يُنْبِتُ الْمَاءُ الزَّرْعَ
Translation: Singing causes hypocrisy to grow in the heart, just as water causes crops to grow.
Source: Bayhaqi.
الْغِنَاءُ means singing, النِّفَاقَ means hypocrisy or inner duplicity, and فِي الْقَلْبِ means “in the heart.” يُنْبِتُ means “causes to grow,” repeated in both halves of the comparison.
The narration uses vivid imagery as a warning concerning the heart. A person should examine the moral influence of habitual entertainment and company. The wording does not enable us to measure hypocrisy in someone’s heart or declare a particular person’s faith invalid.