Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) narrated: the Prophet (peace and blessings be upon him) said: "Whoever removes some distress from a believer, Allah Almighty will remove his distress on the Day of Resurrection; whoever conceals the faults of a believer, Allah Almighty will conceal that person's faults; and whoever grants a believer relief from some hardship, Allah Almighty will grant that person relief from his hardship."
Al-Tabarani recorded it in al-Mu'jam al-Awsat and al-Mu'jam al-Kabir; its chain contains a narrator, Shu'ayb, who used to sell sheets, and he is majhul (unknown).