Sayyidah Duba'ah bint al-Zubayr bin Abd al-Muttalib (may Allah be pleased with her) - who was married to Sayyiduna al-Miqdad - narrates from her husband that he said: I said to the Prophet (peace and blessings be upon him): "There is something I heard from you about which I have come to have doubt." He (peace and blessings be upon him) said: "When any of you has a doubt about a matter, let him ask me about it." I said: "Your saying about your wives: 'I hope for them, after me, (good) from the siddiqin (the truthful ones).'" He (peace and blessings be upon him) said: "Whom do you consider the siddiqin?" We said: "Our children who die young." He (peace and blessings be upon him) said: "Rather, the siddiqin are those who give in charity," and he (peace and blessings be upon him) said it three times.
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17747