The Prophet (peace and blessings be upon him) said:
"When two people are conversing privately, do not come in between them (that is, do not interfere in their private conversation)."
Hadith Referenceصحیح الجامع الصغیر / حرف الألف / 744
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[ابن عساكر] عن ابن عمر. الصحيحة ١٣٩٥: حم، أبو نعيم.