It is narrated from Mujahid (may Allah have mercy on him): Do not say: "I made the crop grow," but say: "I sowed the seed; indeed it is Allah who makes it grow."
This is the saying of Mujahid; a marfu' hadith has also been narrated on this, but it is not strong.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المزارعة / 11751
It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "None of you should say, 'I made the crop grow,' but rather he should say, 'I sowed it.'" Then Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: Have you not heard the saying of Allah: "Have you considered what you sow? Is it you who make it grow, or are We the ones who make it grow?" [Surah al-Waqi'ah: 63-64]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المزارعة / 11752
Hadith Gradingمحدثین:ابن حبان 5722، الطبراني في الاوسط 8024
Hadith Takhrij«ابن حبان 5722، الطبراني في الاوسط 8024»