As is in Shri Sai Satcharita, by Hemadpant .. Chapter XXXVI Page 196

Om Sai Shri Sai Jaya Jaya Sai

Then Shama turned up to the lady and said- "Dear madam, you are a witness to my words.  If within 12 months, you do not get any issue, I will break a coconut against this Deva's head and drive him out of this Masjid.  If I fail in this, I will not call myself Madhav.  You will soon realize what I say."

Bow to Shri Sai - Peace be to all