Sahih Muslim Book 45, Hadith 107
This hadith has been narrated on the authority of Abu Kuraib with the same chain of transmitters.
It does not seem proper for a Siddiq that he should be an invoker of curse.
I heard you cursing your servant during the night when you called him, and she said: I heard Abu Darda' as saying that Allah's Messenger (ﷺ) said: The invoker of curse would neither be intercessor nor witness on the Day of Resurrection.