Muhammad bin Ishaq said, "They (the people of Madyan) are the descendents of Madyan, son of Midyan, son of Ibrahim. Shu`ayb was the son of Mikil bin Yashjur. And in the Syrian language, his name was Yathrun (Jethro)''. I (Ibn Kathir) say, Madyan was the name of the tribe and also a city that is close to Ma`an on route to the Hijaz (from Ash-Sham). Allah said in another Ayah,

﴿وَلَمَّا وَرَدَ مَآءَ مَدْيَنَ وَجَدَ عَلَيْهِ أُمَّةً مِّنَ النَّاسِ يَسْقُونَ﴾

(And when he arrived at the water (a well) of Madyan he found there a group of men watering (their flocks).) ﴿28:23﴾ They are also the people of Al-Aykah (the Woods), as we will mention later on, Allah willing, and our trust is in Him.

﴿قَالَ يَاقَوْمِ اعْبُدُواْ اللَّهَ مَا لَكُمْ مِّنْ إِلَـهٍ غَيْرُهُ﴾

(He said: "O my people! Worship Allah! You have no other God but Him'') and this is the call of all Messengers,

﴿قَدْ جَآءَتْكُم بَيِّنَةٌ مِّن رَّبِّكُمْ﴾

("Verily, a clear proof (sign) from your Lord has come unto you;'') meaning, `Allah has presented the proof and evidences of the truth of what I brought you.' He then advised them and commanded them to give full measure and full weight and not to wrong men in their dealings, meaning, to refrain from cheating people in buying and selling. They used to treacherously avoid giving full weight and measure. Allah said in other Ayat,

﴿وَيْلٌ لِّلْمُطَفِّفِينَ ﴾

(Woe to Al-Mutaffifin (those who give less in measure and weight)...) ﴿83:1﴾ until He said,

﴿لِرَبِّ الْعَـلَمِينَ﴾

(before the Lord of all that exists) ﴿83:6﴾. These Ayat contain a stern warning and sure promise that we ask Allah to save us from. Shu`ayb was called `Speaker of the Prophets', because of his eloquent words and eloquent advice, and Allah stated that Shu`ayb said:

﴿وَلاَ تَقْعُدُواْ بِكُلِّ صِرَطٍ تُوعِدُونَ وَتَصُدُّونَ عَن سَبِيلِ اللَّهِ مَنْ ءَامَنَ بِهِ وَتَبْغُونَهَا عِوَجًا وَاذْكُرُواْ إِذْ كُنتُمْ قَلِيلاً فَكَثَّرَكُمْ وَانظُرُواْ كَيْفَ كَانَ عَـقِبَةُ الْمُفْسِدِينَ - وَإِن كَانَ طَآئِفَةٌ مِّنكُمْ ءامَنُواْ بِالَّذِى أُرْسِلْتُ بِهِ وَطَآئِفَةٌ لَّمْ يْؤْمِنُواْ فَاصْبِرُواْ حَتَّى يَحْكُمَ اللَّهُ بَيْنَنَا وَهُوَ خَيْرُ الْحَـكِمِينَ ﴾

(86. "And sit not on every road, threatening, and hindering from the path of Allah those who believe in Him, and seeking to make it crooked. And remember when you were but few, and He multiplied you. And see what was the end of the mischief-makers.) (87. "And if there is a party of you who believes in that with which I have been sent and a party who does not believe, so be patient until Allah judges between us, and He is the best of judges.'')