Hawzah News Agency – Imam al-Sadiq peace be upon him says:

يُسألُ المَيِّتُ في قَبرِهِ عن خَمسٍ: عن صَلاتِهِ، وزَكاتِهِ، وحَجِّهِ، وصيامِهِ، ووَلايَتِهِ إيّانا أهلَ البَيتِ، فتَقولُ الوَلايةُ مِن جانِبِ القَبرِ للأربَعِ: ما دَخَلَ فِيكُنَّ مِن نَقصٍ فَعلَيَّ تَمامُهُ.

'A dead person will be questioned about five things: his prayer, his alms-tax (zakat), his obligatory pilgrimage (hajj), his fasting, and his acceptance of our divine guardianship (wilaya), the ahl al-bayt. Our guardianship will address the other four from inside the grave, 'Any deficiency that is in you, I will fill.'

Source: al-Kafi, v. 3, p. 241, no. 15