The Prophet (peace and blessings be upon him) said:
"The condition of 'umra is not valid; whoever gives something as 'umra, it becomes his (the recipient's)."
Hadith Referenceصحیح الجامع الصغیر / حرف اللام ألف / 7539
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[حم ن هـ] عن أبي هريرة. الإرواء ١٦٠٧.