Ayyub (as-Sakhtiyani) said: Sa'id bin Jubayr narrated a hadith one day, so I stood up and requested: Please repeat it twice. He replied: I do not milk (the animal) every moment, nor do I drink (every moment).
Hadith Takhrijاس روایت کی سند صحیح ہے۔ دیکھئے: [مصنف ابن أبى شيبه 6688] ، [المحدث الفاصل 780] ، [الجامع 974]
Brief Explanation
(Commentary on Hadiths 416 to 423)
That is, it is not always the case that whenever you ask for something, you will definitely get it; therefore, consider the opportunity as precious and make use of it, and do not be heedless in this regard.
«مَاكُلُّسَاعَةٍأَحْلُبُ» This is a proverb; its meaning and explanation have been stated.