لَا يَأْخُذَنَّ أَحَدُكُمْ مَتَاعَ أَخِيهِ لَاعِبًا وَلَا جَادًّا وَقَالَ سُلَيْمَانُ لَعِبًا وَلَا جِدًّا وَمَنْ أَخَذَ عَصَا أَخِيهِ فَلْيَرُدَّهَا (أبو داود)
"Do not take the property of your brother, neither jokingly nor seriously." And, "Whoever took a stick belonging to his brother, let him return it."
"Seriously" is self-evident as that is stealing. "Jokingly" would not be stealing exactly, but it is prohibited because of the feelings or ill-will which may result. The stick was used as an example because it is an insignificant item of property.
عَنْ أَبِي مَسْعُودٍ الْأَنْصَارِيِّ قَالَ جَاءَ رَجُلٌ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ إِنِّي أُبْدِعَ بِي فَاحْمِلْنِي فَقَالَ مَا عِنْدِي فَقَالَ رَجُلٌ يَا رَسُولَ اللَّهِ أَنَا أَدُلُّهُ عَلَى مَنْ يَحْمِلُهُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ دَلَّ عَلَى خَيْرٍ فَلَهُ مِثْلُ أَجْرِ فَاعِلِهِ (مسلم)
A man came to the Prophet (sas) and said, "I have no conveyance, so help me with one." The Prophet (sas) answered, "I have none." Then, a man said, "O Messenger of Allah, I can direct him to one who will provide a mount for him." The Prophet (sas) said, "Whoever directed to a good deed will get a reward equal to that of its doer."
He has a similar reward because of his facilitating that good deed (if it happens). If it doesn't happen, then his is the reward for his niya and his attempt at bringing it about.
The importance of "cooperation in righteousness and piety".
عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ أَنَّ يَهُودِيَّةً أَتَتْ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بِشَاةٍ مَسْمُومَةٍ فَأَكَلَ مِنْهَا فَجِيءَ بِهَا فَقِيلَ أَلَا نَقْتُلُهَا قَالَ لَا فَمَا زِلْتُ أَعْرِفُهَا فِي لَهَوَاتِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ (البخاري)
Anas ibn Malik reported that a Jewish woman gave the Prophet (sas) some poisoned lamb and he ate from it. She was brought before him and it was said, "Will you not kill her?" He answered, "No." I continued to see the signs of that [poisoning] in the flesh of his mouth after that.
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ بَعَثَ مُعَاذًا وَأَبَا مُوسَى إِلَى الْيَمَنِ قَالَ يَسِّرَا وَلَا تُعَسِّرَا وَبَشِّرَا وَلَا تُنَفِّرَا وَتَطَاوَعَا وَلَا تَخْتَلِفَا (البخاري)
The Prophet (sas) sent Mu'adh and Abu Musa to Yemen saying to them, "Make things easy and do not make them difficult. Be bringers of good news and do not repel people. And, be compliant and flexible with each other and do not differ."
عَنْ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ {خُذْ الْعَفْوَ وَأْمُرْ بِالْعُرْفِ} قَالَ مَا أَنْزَلَ اللَّهُ إِلَّا فِي أَخْلَاقِ النَّاسِ وَقَالَ عَبْدُ اللَّهِ بْنُ بَرَّادٍ حَدَّثَنَا أَبُو أُسَامَةَ حَدَّثَنَا هِشَامٌ عَنْ أَبِيهِ عَنْ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ قَالَ أَمَرَ اللَّهُ نَبِيَّهُ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَنْ يَأْخُذَ الْعَفْوَ مِنْ أَخْلَاقِ النَّاسِ أَوْ كَمَا قَالَ
From Abullah ibn Az-Zubair regarding Allah's statement {Take the easy and enjoin all that is right...}, he said, "Allah did send this except regarding the character of people." And, he said, "Allah commanded his Messenger (sas) to take the easy way with the people and their character."