Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: Three supplications are accepted, there is no doubt in their acceptance: the supplication of the oppressed, the supplication of the traveler, and the supplication of parents for their children.
Hadith Referenceالفتح الربانی / كتاب آفات اللسان / 9979