Sahih Muslim
The Book of Virtue, Good Manners and Joining of the Ties of Relationship (Kitab Al-Birr was-Salat-I-wal-Adab)
Book Number: 032 / Hadith Number: 6367
Abu Huraira reported that Allah's Messenger (may peace be upon him) said to a woman of the Ansar: In case anyone amongst you sees the sad demise of three children of (hers) and she resigns herself to the will of God hoping to get reward, she would be admitted to Paradise. A woman from amongst them said: Allah's Messenger, even if they (the children who die) are two. Thereupon, he (the Holy Prophet, ) said: Even if they are two.